[v8-dev] MIPS: port Link function contexts directly to the previous context. (issue6995128)

[plind44]

Reviewers: Søren Gjesse,

Description:
MIPS: port Link function contexts directly to the previous context.
Ported r8238 (7803ed7)

This commit would have also included changes to macro-assembler-mips.cc,
however Kevin M. did those changes in later commit r8248. (thx!)

BUG=
TEST=


Please review this at http://codereview.chromium.org/6995128/

Affected files:
  M src/mips/code-stubs-mips.cc


Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index  
46e99c4c8c694547eda7ea85c3e243cbbba569b0..3d1de6726392b27f29ed9ffd6a737b84211c115c  
100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -167,10 +167,10 @@ void FastNewContextStub::Generate(MacroAssembler*  
masm) {
   __ li(a1, Operand(Smi::FromInt(0)));
   __ sw(a3, MemOperand(v0, Context::SlotOffset(Context::CLOSURE_INDEX)));
   __ sw(v0, MemOperand(v0, Context::SlotOffset(Context::FCONTEXT_INDEX)));
-  __ sw(a1, MemOperand(v0, Context::SlotOffset(Context::PREVIOUS_INDEX)));
+  __ sw(cp, MemOperand(v0, Context::SlotOffset(Context::PREVIOUS_INDEX)));
   __ sw(a1, MemOperand(v0, Context::SlotOffset(Context::EXTENSION_INDEX)));

-  // Copy the global object from the surrounding context.
+  // Copy the global object from the previous context.
   __ lw(a1, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
   __ sw(a1, MemOperand(v0, Context::SlotOffset(Context::GLOBAL_INDEX)));



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