[x86] Remove obsolete and unused GetBuiltinFunction.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1647653004

Cr-Commit-Position: refs/heads/master@{#33577}

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.

src/ia32/macro-assembler-ia32.h

@@ -331,9 +331,6 @@ class MacroAssembler: public Assembler {
                       const ParameterCount& actual, InvokeFlag flag,
                       const CallWrapper& call_wrapper);
 
-  // Store the function for the given builtin in the target register.
-  void GetBuiltinFunction(Register target, int native_context_index);
-
   // Expression support
   // cvtsi2sd instruction only writes to the low 64-bit of dst register, which
   // hinders register renaming and makes dependence chains longer. So we use

src/x87/macro-assembler-x87.cc

@@ -2111,14 +2111,6 @@ 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.

src/x87/macro-assembler-x87.h

@@ -326,9 +326,6 @@ class MacroAssembler: public Assembler {
                       const ParameterCount& actual, InvokeFlag flag,
                       const CallWrapper& call_wrapper);
 
-  // Store the function for the given builtin in the target register.
-  void GetBuiltinFunction(Register target, int native_context_index);
-
 
   // Expression support
   // Support for constant splitting.