[x86] Remove obsolete and unused GetBuiltinFunction.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index b3d440578333b9ef5dc7c4b000349d0cbc740852..ee9b17ad39ca64a54c999498d2ac3aca18f81bdd 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -2147,14 +2147,6 @@ void MacroAssembler::InvokeFunction(Handle<JSFunction> function,
 }
 
 
-void MacroAssembler::GetBuiltinFunction(Register target,
-                                        int native_context_index) {
-  // Load the JavaScript builtin function from the builtins object.
-  mov(target, NativeContextOperand());
-  mov(target, ContextOperand(target, native_context_index));
-}
-
-
 void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
   if (context_chain_length > 0) {
     // Move up the chain of contexts to the context containing the slot.