MIPS: Make _CallFunction proxy-aware.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index e640b53e8df0c4e06e351d9b5e132b7ff7a99c1e..fee9dadc2135b450f6697b8fc1de462dd3ab7bc1 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -3171,12 +3171,12 @@ void LCodeGen::DoCallNamed(LCallNamed* instr) {
 
 
 void LCodeGen::DoCallFunction(LCallFunction* instr) {
+  ASSERT(ToRegister(instr->function()).is(a1));
   ASSERT(ToRegister(instr->result()).is(v0));
 
   int arity = instr->arity();
   CallFunctionStub stub(arity, NO_CALL_FUNCTION_FLAGS);
   CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
-  __ Drop(1);
   __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
 }