PPC: Fix constant pools for tail calls.

src/ppc/builtins-ppc.cc

Index: src/ppc/builtins-ppc.cc
diff --git a/src/ppc/builtins-ppc.cc b/src/ppc/builtins-ppc.cc
index d8ef40c8493387da2dc9ae9747873123414dffa9..3c83c942bbfb8bd789eef918b1594ec1c9f49813 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -2077,13 +2077,7 @@ void PrepareForTailCall(MacroAssembler* masm, Register args_reg,
 
   // Restore caller's frame pointer and return address now as they will be
   // overwritten by the copying loop.
-  if (FLAG_enable_embedded_constant_pool) {
-    __ LoadP(kConstantPoolRegister,
-             MemOperand(fp, StandardFrameConstants::kConstantPoolOffset));
-  }
-  __ LoadP(r0, MemOperand(fp, StandardFrameConstants::kCallerPCOffset));
-  __ LoadP(fp, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
-  __ mtlr(r0);
+  __ RestoreFrameStateForTailCall();
 
   // Now copy callee arguments to the caller frame going backwards to avoid
   // callee arguments corruption (source and destination areas could overlap).