[cleanup] Fix -Wshadow warnings in test/fuzzer/regexp

Don't really have a good name for this inner TryCatch.

Bug: v8:12244
Change-Id: I4c1353bcd98e78e49d0354e285249302a8ee0dd8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3183522Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77097}

test/fuzzer/regexp.cc

@@ -75,7 +75,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   i::Handle<i::JSRegExp> regexp;
   {
     CHECK(!i_isolate->has_pending_exception());
-    v8::TryCatch try_catch(isolate);
+    v8::TryCatch try_catch_inner(isolate);
     // Create a string so that we can calculate a hash from the input data.
     std::string str = std::string(reinterpret_cast<const char*>(data), size);
     i::JSRegExp::Flags flag = static_cast<i::JSRegExp::Flags>(