[regexp] Remove IsRegExp intrinsic

src/interpreter/interpreter-intrinsics.cc

Index: src/interpreter/interpreter-intrinsics.cc
diff --git a/src/interpreter/interpreter-intrinsics.cc b/src/interpreter/interpreter-intrinsics.cc
index 0366754a122f570653c80e01de92621a747b0048..81ce5563f8202c059bf1ddc8d8f2b825de2e69e7 100644
--- a/src/interpreter/interpreter-intrinsics.cc
+++ b/src/interpreter/interpreter-intrinsics.cc
@@ -184,10 +184,6 @@ Node* IntrinsicsHelper::IsJSProxy(Node* input, Node* arg_count, Node* context) {
   return IsInstanceType(input, JS_PROXY_TYPE);
 }
 
-Node* IntrinsicsHelper::IsRegExp(Node* input, Node* arg_count, Node* context) {
-  return IsInstanceType(input, JS_REGEXP_TYPE);
-}
-
 Node* IntrinsicsHelper::IsTypedArray(Node* input, Node* arg_count,
                                      Node* context) {
   return IsInstanceType(input, JS_TYPED_ARRAY_TYPE);