Revert of [runtime] Replace global object link with native context link in all contexts.

src/crankshaft/mips/lithium-codegen-mips.cc

Index: src/crankshaft/mips/lithium-codegen-mips.cc
diff --git a/src/crankshaft/mips/lithium-codegen-mips.cc b/src/crankshaft/mips/lithium-codegen-mips.cc
index 64635daccbfd4fd08b50e39dfdf1ad7717b5ea7a..ba7bdf03f466cfd1d51b8a2b36c89512eaeeb59e 100644
--- a/src/crankshaft/mips/lithium-codegen-mips.cc
+++ b/src/crankshaft/mips/lithium-codegen-mips.cc
@@ -217,7 +217,7 @@
         // Load parameter from stack.
         __ lw(a0, MemOperand(fp, parameter_offset));
         // Store it in the context.
-        MemOperand target = ContextMemOperand(cp, var->index());
+        MemOperand target = ContextOperand(cp, var->index());
         __ sw(a0, target);
         // Update the write barrier. This clobbers a3 and a0.
         if (need_write_barrier) {
@@ -2741,7 +2741,7 @@
   Register context = ToRegister(instr->context());
   Register result = ToRegister(instr->result());
 
-  __ lw(result, ContextMemOperand(context, instr->slot_index()));
+  __ lw(result, ContextOperand(context, instr->slot_index()));
   if (instr->hydrogen()->RequiresHoleCheck()) {
     __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
 
@@ -2761,7 +2761,7 @@
   Register context = ToRegister(instr->context());
   Register value = ToRegister(instr->value());
   Register scratch = scratch0();
-  MemOperand target = ContextMemOperand(context, instr->slot_index());
+  MemOperand target = ContextOperand(context, instr->slot_index());
 
   Label skip_assignment;
 
@@ -3241,8 +3241,9 @@
   __ Branch(&result_in_receiver);
   __ bind(&global_object);
   __ lw(result, FieldMemOperand(function, JSFunction::kContextOffset));
-  __ lw(result, ContextMemOperand(result, Context::NATIVE_CONTEXT_INDEX));
-  __ lw(result, ContextMemOperand(result, Context::GLOBAL_PROXY_INDEX));
+  __ lw(result,
+        ContextOperand(result, Context::GLOBAL_OBJECT_INDEX));
+  __ lw(result, FieldMemOperand(result, JSGlobalObject::kGlobalProxyOffset));
 
   if (result.is(receiver)) {
     __ bind(&result_in_receiver);