[intrinsics] Remove unused %_RegExpExec and %_NumberToString.

src/compiler/js-intrinsic-lowering.cc

Index: src/compiler/js-intrinsic-lowering.cc
diff --git a/src/compiler/js-intrinsic-lowering.cc b/src/compiler/js-intrinsic-lowering.cc
index 31cfe1116daed9117578f3c33e47c45ea3a64a9e..c1e4708fcc6d4dbf82c006c52425a49f55f662be 100644
--- a/src/compiler/js-intrinsic-lowering.cc
+++ b/src/compiler/js-intrinsic-lowering.cc
@@ -58,8 +58,6 @@ Reduction JSIntrinsicLowering::Reduce(Node* node) {
       return ReduceFixedArrayGet(node);
     case Runtime::kInlineFixedArraySet:
       return ReduceFixedArraySet(node);
-    case Runtime::kInlineRegExpExec:
-      return ReduceRegExpExec(node);
     case Runtime::kInlineSubString:
       return ReduceSubString(node);
     case Runtime::kInlineToInteger:
@@ -261,11 +259,6 @@ Reduction JSIntrinsicLowering::ReduceFixedArraySet(Node* node) {
 }
 
 
-Reduction JSIntrinsicLowering::ReduceRegExpExec(Node* node) {
-  return Change(node, CodeFactory::RegExpExec(isolate()), 4);
-}
-
-
 Reduction JSIntrinsicLowering::ReduceSubString(Node* node) {
   return Change(node, CodeFactory::SubString(isolate()), 3);
 }