Simplify MacroAssembler::InvokePrologue a bit.

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index 4a5a386fa0f7cbf09eb0324bad52521f127c74c0..9f66a0796ebe6f104800aa68682f13182f9f8ea2 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -3985,8 +3985,6 @@ void MacroAssembler::MovToFloatParameters(DoubleRegister src1,
 
 void MacroAssembler::InvokePrologue(const ParameterCount& expected,
                                     const ParameterCount& actual,
-                                    Handle<Code> code_constant,
-                                    Register code_reg,
                                     Label* done,
                                     bool* definitely_mismatches,
                                     InvokeFlag flag,
@@ -4006,7 +4004,6 @@ void MacroAssembler::InvokePrologue(const ParameterCount& expected,
   // passed in registers.
   DCHECK(actual.is_immediate() || actual.reg().is(a0));
   DCHECK(expected.is_immediate() || expected.reg().is(a2));
-  DCHECK((!code_constant.is_null() && code_reg.is(no_reg)) || code_reg.is(a3));
 
   if (expected.is_immediate()) {
     DCHECK(actual.is_immediate());
@@ -4034,11 +4031,6 @@ void MacroAssembler::InvokePrologue(const ParameterCount& expected,
   }
 
   if (!definitely_matches) {
-    if (!code_constant.is_null()) {
-      li(a3, Operand(code_constant));
-      addiu(a3, a3, Code::kHeaderSize - kHeapObjectTag);
-    }
-
     Handle<Code> adaptor =
         isolate()->builtins()->ArgumentsAdaptorTrampoline();
     if (flag == CALL_FUNCTION) {
@@ -4067,8 +4059,7 @@ void MacroAssembler::InvokeCode(Register code,
   Label done;
 
   bool definitely_mismatches = false;
-  InvokePrologue(expected, actual, Handle<Code>::null(), code,
-                 &done, &definitely_mismatches, flag,
+  InvokePrologue(expected, actual, &done, &definitely_mismatches, flag,
                  call_wrapper);
   if (!definitely_mismatches) {
     if (flag == CALL_FUNCTION) {