Fix register aliasing after r26306, r26275.

src/ic/mips/handler-compiler-mips.cc

Index: src/ic/mips/handler-compiler-mips.cc
diff --git a/src/ic/mips/handler-compiler-mips.cc b/src/ic/mips/handler-compiler-mips.cc
index d9dc2b0dc3cbb1ff262263d2ac44c2eb5e27473f..cb394da9a1b5a7af5a8e593e5f4083e47da4a613 100644
--- a/src/ic/mips/handler-compiler-mips.cc
+++ b/src/ic/mips/handler-compiler-mips.cc
@@ -18,7 +18,8 @@ namespace internal {
 
 void NamedLoadHandlerCompiler::GenerateLoadViaGetter(
     MacroAssembler* masm, Handle<HeapType> type, Register receiver,
-    Register holder, int accessor_index, int expected_arguments) {
+    Register holder, int accessor_index, int expected_arguments,
+    Register scratch) {
   // ----------- S t a t e -------------
   //  -- a0    : receiver
   //  -- a2    : name
@@ -28,11 +29,14 @@ void NamedLoadHandlerCompiler::GenerateLoadViaGetter(
     FrameScope scope(masm, StackFrame::INTERNAL);
 
     if (accessor_index >= 0) {
+      DCHECK(!holder.is(scratch));
+      DCHECK(!receiver.is(scratch));
       // Call the JavaScript getter with the receiver on the stack.
       if (IC::TypeToMap(*type, masm->isolate())->IsJSGlobalObjectMap()) {
         // Swap in the global receiver.
-        __ lw(receiver,
+        __ lw(scratch,
               FieldMemOperand(receiver, JSGlobalObject::kGlobalProxyOffset));
+        receiver = scratch;
       }
       __ push(receiver);
       ParameterCount actual(0);
@@ -54,7 +58,8 @@ void NamedLoadHandlerCompiler::GenerateLoadViaGetter(
 
 void NamedStoreHandlerCompiler::GenerateStoreViaSetter(
     MacroAssembler* masm, Handle<HeapType> type, Register receiver,
-    Register holder, int accessor_index, int expected_arguments) {
+    Register holder, int accessor_index, int expected_arguments,
+    Register scratch) {
   // ----------- S t a t e -------------
   //  -- ra    : return address
   // -----------------------------------
@@ -65,11 +70,15 @@ void NamedStoreHandlerCompiler::GenerateStoreViaSetter(
     __ push(value());
 
     if (accessor_index >= 0) {
+      DCHECK(!holder.is(scratch));
+      DCHECK(!receiver.is(scratch));
+      DCHECK(!value().is(scratch));
       // Call the JavaScript setter with receiver and value on the stack.
       if (IC::TypeToMap(*type, masm->isolate())->IsJSGlobalObjectMap()) {
         // Swap in the global receiver.
-        __ lw(receiver,
+        __ lw(scratch,
               FieldMemOperand(receiver, JSGlobalObject::kGlobalProxyOffset));
+        receiver = scratch;
       }
       __ Push(receiver, value());
       ParameterCount actual(1);