PPC: Clean up register save/restore logic.

src/ppc/code-stubs-ppc.h

Index: src/ppc/code-stubs-ppc.h
diff --git a/src/ppc/code-stubs-ppc.h b/src/ppc/code-stubs-ppc.h
index 3c71a23ea2af8fe4fc55018176b4b49ab5adb87d..238c9f741e93577745c8fdf2836368027c842f73 100644
--- a/src/ppc/code-stubs-ppc.h
+++ b/src/ppc/code-stubs-ppc.h
@@ -181,7 +181,7 @@ class RecordWriteStub : public PlatformCodeStub {
       masm->MultiPush(kJSCallerSaved & ~scratch1_.bit());
       if (mode == kSaveFPRegs) {
         // Save all volatile FP registers except d0.
-        masm->SaveFPRegs(sp, 1, DoubleRegister::kNumVolatileRegisters - 1);
+        masm->MultiPushDoubles(kCallerSavedDoubles & ~d0.bit());
       }
     }
 
@@ -189,7 +189,7 @@ class RecordWriteStub : public PlatformCodeStub {
                                            SaveFPRegsMode mode) {
       if (mode == kSaveFPRegs) {
         // Restore all volatile FP registers except d0.
-        masm->RestoreFPRegs(sp, 1, DoubleRegister::kNumVolatileRegisters - 1);
+        masm->MultiPopDoubles(kCallerSavedDoubles & ~d0.bit());
       }
       masm->MultiPop(kJSCallerSaved & ~scratch1_.bit());
       masm->pop(r0);