Rollback trunk to 3.21.15.

src/mips/codegen-mips.cc

Index: src/mips/codegen-mips.cc
diff --git a/src/mips/codegen-mips.cc b/src/mips/codegen-mips.cc
index a12faee433a8bb70dbaa09e131c90d836c24c73a..5c847fc8f6227e7896aaacb66163eb244dd59764 100644
--- a/src/mips/codegen-mips.cc
+++ b/src/mips/codegen-mips.cc
@@ -635,8 +635,7 @@ void Code::GetCodeAgeAndParity(byte* sequence, Age* age,
 }
 
 
-void Code::PatchPlatformCodeAge(Isolate* isolate,
-                                byte* sequence,
+void Code::PatchPlatformCodeAge(byte* sequence,
                                 Code::Age age,
                                 MarkingParity parity) {
   uint32_t young_length;
@@ -645,7 +644,7 @@ void Code::PatchPlatformCodeAge(Isolate* isolate,
     CopyBytes(sequence, young_sequence, young_length);
     CPU::FlushICache(sequence, young_length);
   } else {
-    Code* stub = GetCodeAgeStub(isolate, age, parity);
+    Code* stub = GetCodeAgeStub(age, parity);
     CodePatcher patcher(sequence, young_length / Assembler::kInstrSize);
     // Mark this code sequence for FindPlatformCodeAgeSequence()
     patcher.masm()->nop(Assembler::CODE_AGE_MARKER_NOP);