Revert of [intrinsic] Drop the %_ValueOf intrinsic.

src/full-codegen/ppc/full-codegen-ppc.cc

Index: src/full-codegen/ppc/full-codegen-ppc.cc
diff --git a/src/full-codegen/ppc/full-codegen-ppc.cc b/src/full-codegen/ppc/full-codegen-ppc.cc
index 40f387484d59f1fa888eafc9ce031a9187a699e6..f6a7197dc8806b2ddd565751ef9ea03aec057a9e 100644
--- a/src/full-codegen/ppc/full-codegen-ppc.cc
+++ b/src/full-codegen/ppc/full-codegen-ppc.cc
@@ -2853,6 +2853,24 @@
 }
 
 
+void FullCodeGenerator::EmitValueOf(CallRuntime* expr) {
+  ZoneList<Expression*>* args = expr->arguments();
+  DCHECK(args->length() == 1);
+  VisitForAccumulatorValue(args->at(0));  // Load the object.
+
+  Label done;
+  // If the object is a smi return the object.
+  __ JumpIfSmi(r3, &done);
+  // If the object is not a value type, return the object.
+  __ CompareObjectType(r3, r4, r4, JS_VALUE_TYPE);
+  __ bne(&done);
+  __ LoadP(r3, FieldMemOperand(r3, JSValue::kValueOffset));
+
+  __ bind(&done);
+  context()->Plug(r3);
+}
+
+
 void FullCodeGenerator::EmitStringCharFromCode(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);