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

src/compiler/arm64/code-generator-arm64.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/compiler/code-generator.h"
 
 #include "src/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 274 matching lines @@
     if (mode_ > RecordWriteMode::kValueIsPointer) {
       __ JumpIfSmi(value_, exit());
     }
     if (mode_ > RecordWriteMode::kValueIsMap) {
       __ CheckPageFlagClear(value_, scratch0_,
                             MemoryChunk::kPointersToHereAreInterestingMask,
                             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 lr if the frame was elided.
+      __ Push(lr);
+    }
     RecordWriteStub stub(isolate(), object_, scratch0_, scratch1_,
                          EMIT_REMEMBERED_SET, save_fp_mode);
     __ Add(scratch1_, object_, index_);
     __ CallStub(&stub);
+    if (!frame()->needs_frame()) {
+      __ Pop(lr);
+    }
   }
 
  private:
   Register const object_;
   Operand const index_;
   Register const value_;
   Register const scratch0_;
   Register const scratch1_;
   RecordWriteMode const mode_;
 };
@@ skipping 1400 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8