[regexp] Fix compilation for interpreted regexp

Change-Id: Icf0507c6e50533c64a42fcf934bb1472ff21f68a
Reviewed-on: https://chromium-review.googlesource.com/1163618
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54925}

src/builtins/builtins-regexp-gen.cc

@@ -338,8 +338,8 @@ TNode<HeapObject> RegExpBuiltinsAssembler::RegExpExecInternal(
 // time or if regexp entry in generated code is turned off runtime switch or
 // at compilation.
 #ifdef V8_INTERPRETED_REGEXP
-  return CallRuntime(Runtime::kRegExpExec, context, regexp, string, last_index,
-                     match_info);
+  return CAST(CallRuntime(Runtime::kRegExpExec, context, regexp, string,
+                          last_index, match_info));
 #else  // V8_INTERPRETED_REGEXP
   ToDirectStringAssembler to_direct(state(), string);