[Turbofan] Save and restore lr in OutOfLineRecordWrite when frame is elided.

src/compiler/mips64/code-generator-mips64.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
@@ skipping 216 matching lines @@
     if (mode_ > RecordWriteMode::kValueIsPointer) {
       __ JumpIfSmi(value_, exit());
     }
     if (mode_ > RecordWriteMode::kValueIsMap) {
       __ CheckPageFlag(value_, scratch0_,
                        MemoryChunk::kPointersToHereAreInterestingMask, eq,
                        exit());
     }
     SaveFPRegsMode const save_fp_mode =
         frame()->DidAllocateDoubleRegisters() ? kSaveFPRegs : kDontSaveFPRegs;
-    // TODO(turbofan): Once we get frame elision working, we need to save
-    // and restore lr properly here if the frame was elided.
+    if (!frame()->needs_frame()) {
+      // We need to save and restore ra if the frame was elided.
+      __ Push(ra);
+    }
     RecordWriteStub stub(isolate(), object_, scratch0_, scratch1_,
                          EMIT_REMEMBERED_SET, save_fp_mode);
     __ Daddu(scratch1_, object_, index_);
     __ CallStub(&stub);
+    if (!frame()->needs_frame()) {
+      __ Pop(ra);
+    }
   }
 
  private:
   Register const object_;
   Register const index_;
   Register const value_;
   Register const scratch0_;
   Register const scratch1_;
   RecordWriteMode const mode_;
 };
@@ skipping 1857 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8