[regexp] Remove IsRegExp intrinsic

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 69daeb4c57d36e53b77927a94aa13a31ac1ba1db..0a5da13b5990eeb156b383ab6275c3d17017589c 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -11954,16 +11954,6 @@ void HOptimizedGraphBuilder::GenerateIsTypedArray(CallRuntime* call) {
 }
 
 
-void HOptimizedGraphBuilder::GenerateIsRegExp(CallRuntime* call) {
-  DCHECK(call->arguments()->length() == 1);
-  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
-  HValue* value = Pop();
-  HHasInstanceTypeAndBranch* result =
-      New<HHasInstanceTypeAndBranch>(value, JS_REGEXP_TYPE);
-  return ast_context()->ReturnControl(result, call->id());
-}
-
-
 void HOptimizedGraphBuilder::GenerateToInteger(CallRuntime* call) {
   DCHECK_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));