[intrinsics] Nuke the %_StringCharFromCode intrinsic.

src/full-codegen/x64/full-codegen-x64.cc

Index: src/full-codegen/x64/full-codegen-x64.cc
diff --git a/src/full-codegen/x64/full-codegen-x64.cc b/src/full-codegen/x64/full-codegen-x64.cc
index 1be891a95db47dc1efa33ce5f7ec3d72cf9b5505..09c417a40fd1c45dd41265ac528bf1ddf6df8d8e 100644
--- a/src/full-codegen/x64/full-codegen-x64.cc
+++ b/src/full-codegen/x64/full-codegen-x64.cc
@@ -2654,25 +2654,6 @@ void FullCodeGenerator::EmitClassOf(CallRuntime* expr) {
 }
 
 
-void FullCodeGenerator::EmitStringCharFromCode(CallRuntime* expr) {
-  ZoneList<Expression*>* args = expr->arguments();
-  DCHECK(args->length() == 1);
-
-  VisitForAccumulatorValue(args->at(0));
-
-  Label done;
-  StringCharFromCodeGenerator generator(rax, rbx);
-  generator.GenerateFast(masm_);
-  __ jmp(&done);
-
-  NopRuntimeCallHelper call_helper;
-  generator.GenerateSlow(masm_, call_helper);
-
-  __ bind(&done);
-  context()->Plug(rbx);
-}
-
-
 void FullCodeGenerator::EmitStringCharCodeAt(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 2);