Revert of [regexp] Remove remainder of native RegExpExecStub (patchset #8...

Revert of [regexp] Remove remainder of native RegExpExecStub (patchset #8 id:140001 of https://codereview.chromium.org/2752143003/ )

Reason for revert:
https://build.chromium.org/p/client.v8.ports/builders/V8%20Android%20Arm64%20-%20builder/builds/9118

Original issue's description:
> [regexp] Remove remainder of native RegExpExecStub
>
> If we avoid throwing a stack overflow exception from Irregexp code during
> direct calls, there is no need to construct exit frames before the Irregexp
> call anymore. As that was the last remaining blocker, we can now implement the
> entire stub in CSA.
>
> BUG=v8:5339
>
> Review-Url: https://codereview.chromium.org/2752143003
> Cr-Commit-Position: refs/heads/master@{#44770}
> Committed: https://chromium.googlesource.com/v8/v8/+/74f2497eae068f85da26904d8c451376c77957bf

TBR=ishell@chromium.org,mstarzinger@chromium.org,jgruber@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5339

Review-Url: https://codereview.chromium.org/2827243005
Cr-Commit-Position: refs/heads/master@{#44772}

src/code-factory.cc

@@ -237,6 +237,12 @@ Callable CodeFactory::RegExpExec(Isolate* isolate) {
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
 }
 
+// static
+Callable CodeFactory::RegExpExec(Isolate* isolate) {
+  RegExpExecStub stub(isolate);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
+
 // static
 Callable CodeFactory::StringFromCharCode(Isolate* isolate) {
   Handle<Code> code(isolate->builtins()->StringFromCharCode());