[regexp] Fix clusterfuzz syntax errors for regexp-builtins

Bug: chromium:996232
Change-Id: I1df23835c18f5491a95e2faff17594ee7419cf75
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1763157
Auto-Submit: Joshua Litt <joshualitt@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63327}

test/fuzzer/regexp-builtins.cc

@@ -339,8 +339,8 @@ bool ResultsAreIdentical(FuzzerArgs* args) {
       "assertEquals(fast.result, slow.result);\n"
       "if (fast.result !== null) {\n"
       "  assertEquals(fast.result.groups, slow.result.groups);\n"
-      "  assertEquals(fast.results.indices, slow.result.indices;\n"
-      "  if (fast.result.indices !== null) {\n"
+      "  assertEquals(fast.result.indices, slow.result.indices);\n"
+      "  if (fast.result.indices !== undefined) {\n"
       "    assertEquals(fast.result.indices.groups,\n"
       "                 slow.result.indices.groups);\n"
       "  }\n"