Turn FastNewContextStub into a HydrogenCodeStub.

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index 32d7e60896c01af3d16bc6e05dc17dc72febad0e..2c9b2756ed6683b7a704c6e27b3d803d8b00eb98 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -202,20 +202,22 @@ void FullCodeGenerator::Generate() {
   if (heap_slots > 0) {
     // Argument to NewContext is the function, which is still in r1.
     Comment cmnt(masm_, "[ Allocate context");
-    __ push(r1);
     if (FLAG_harmony_scoping && info->scope()->is_global_scope()) {
+      __ push(r1);
       __ Push(info->scope()->GetScopeInfo());
       __ CallRuntime(Runtime::kNewGlobalContext, 2);
     } else if (heap_slots <= FastNewContextStub::kMaximumSlots) {
       FastNewContextStub stub(heap_slots);
       __ CallStub(&stub);
     } else {
+      __ push(r1);
       __ CallRuntime(Runtime::kNewFunctionContext, 1);
     }
     function_in_register = false;
-    // Context is returned in both r0 and cp.  It replaces the context
-    // passed to us.  It's saved in the stack and kept live in cp.
-    __ str(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+    // Context is returned in r0.  It replaces the context passed to us.
+    // It's saved in the stack and kept live in cp.
+    __ mov(cp, r0);
+    __ str(r0, MemOperand(fp, StandardFrameConstants::kContextOffset));
     // Copy any necessary parameters into the context.
     int num_parameters = info->scope()->num_parameters();
     for (int i = 0; i < num_parameters; i++) {