Add asserts to ensure that we:

src/mips/stub-cache-mips.cc

Index: src/mips/stub-cache-mips.cc
===================================================================
--- src/mips/stub-cache-mips.cc	(revision 9277)
+++ src/mips/stub-cache-mips.cc	(working copy)
@@ -554,9 +554,10 @@
 }
 
 
-static MaybeObject* GenerateFastApiDirectCall(MacroAssembler* masm,
-                                      const CallOptimization& optimization,
-                                      int argc) {
+static MaybeObject* GenerateFastApiDirectCall(
+    MacroAssembler* masm,
+    const CallOptimization& optimization,
+    int argc) {
   // ----------- S t a t e -------------
   //  -- sp[0]              : holder (set by CheckPrototypes)
   //  -- sp[4]              : callee js function
@@ -626,6 +627,7 @@
       ExternalReference(&fun,
                         ExternalReference::DIRECT_API_CALL,
                         masm->isolate());
+  AllowExternalCallThatCantCauseGC scope(masm);
   return masm->TryCallApiFunctionAndReturn(ref, kStackUnwindSpace);
 }
 
@@ -804,7 +806,7 @@
                                         miss_label);
 
     // Call a runtime function to load the interceptor property.
-    __ EnterInternalFrame();
+    FrameScope scope(masm, StackFrame::INTERNAL);
     // Save the name_ register across the call.
     __ push(name_);
 
@@ -822,7 +824,8 @@
 
     // Restore the name_ register.
     __ pop(name_);
-    __ LeaveInternalFrame();
+
+    // Leave the internal frame.
   }
 
   void LoadWithInterceptor(MacroAssembler* masm,
@@ -831,19 +834,20 @@
                            JSObject* holder_obj,
                            Register scratch,
                            Label* interceptor_succeeded) {
-    __ EnterInternalFrame();
+    {
+      FrameScope scope(masm, StackFrame::INTERNAL);
 
-    __ Push(holder, name_);
+      __ Push(holder, name_);
 
-    CompileCallLoadPropertyWithInterceptor(masm,
-                                           receiver,
-                                           holder,
-                                           name_,
-                                           holder_obj);
+      CompileCallLoadPropertyWithInterceptor(masm,
+                                             receiver,
+                                             holder,
+                                             name_,
+                                             holder_obj);
 
-    __ pop(name_);  // Restore the name.
-    __ pop(receiver);  // Restore the holder.
-    __ LeaveInternalFrame();
+      __ pop(name_);  // Restore the name.
+      __ pop(receiver);  // Restore the holder.
+    }
 
     // If interceptor returns no-result sentinel, call the constant function.
     __ LoadRoot(scratch, Heap::kNoInterceptorResultSentinelRootIndex);
@@ -1317,41 +1321,43 @@
 
     // Save necessary data before invoking an interceptor.
     // Requires a frame to make GC aware of pushed pointers.
-    __ EnterInternalFrame();
+    {
+      FrameScope frame_scope(masm(), StackFrame::INTERNAL);
 
-    if (lookup->type() == CALLBACKS && !receiver.is(holder_reg)) {
-      // CALLBACKS case needs a receiver to be passed into C++ callback.
-      __ Push(receiver, holder_reg, name_reg);
-    } else {
-      __ Push(holder_reg, name_reg);
-    }
+      if (lookup->type() == CALLBACKS && !receiver.is(holder_reg)) {
+        // CALLBACKS case needs a receiver to be passed into C++ callback.
+        __ Push(receiver, holder_reg, name_reg);
+      } else {
+        __ Push(holder_reg, name_reg);
+      }
 
-    // Invoke an interceptor.  Note: map checks from receiver to
-    // interceptor's holder has been compiled before (see a caller
-    // of this method).
-    CompileCallLoadPropertyWithInterceptor(masm(),
-                                           receiver,
-                                           holder_reg,
-                                           name_reg,
-                                           interceptor_holder);
+      // Invoke an interceptor.  Note: map checks from receiver to
+      // interceptor's holder has been compiled before (see a caller
+      // of this method).
+      CompileCallLoadPropertyWithInterceptor(masm(),
+                                             receiver,
+                                             holder_reg,
+                                             name_reg,
+                                             interceptor_holder);
 
-    // Check if interceptor provided a value for property.  If it's
-    // the case, return immediately.
-    Label interceptor_failed;
-    __ LoadRoot(scratch1, Heap::kNoInterceptorResultSentinelRootIndex);
-    __ Branch(&interceptor_failed, eq, v0, Operand(scratch1));
-    __ LeaveInternalFrame();
-    __ Ret();
+      // Check if interceptor provided a value for property.  If it's
+      // the case, return immediately.
+      Label interceptor_failed;
+      __ LoadRoot(scratch1, Heap::kNoInterceptorResultSentinelRootIndex);
+      __ Branch(&interceptor_failed, eq, v0, Operand(scratch1));
+      frame_scope.GenerateLeaveFrame();
+      __ Ret();
 
-    __ bind(&interceptor_failed);
-    __ pop(name_reg);
-    __ pop(holder_reg);
-    if (lookup->type() == CALLBACKS && !receiver.is(holder_reg)) {
-      __ pop(receiver);
+      __ bind(&interceptor_failed);
+      __ pop(name_reg);
+      __ pop(holder_reg);
+      if (lookup->type() == CALLBACKS && !receiver.is(holder_reg)) {
+        __ pop(receiver);
+      }
+
+      // Leave the internal frame.
     }
 
-    __ LeaveInternalFrame();
-
     // Check that the maps from interceptor's holder to lookup's holder
     // haven't changed.  And load lookup's holder into |holder| register.
     if (interceptor_holder != lookup->holder()) {