[regexp] Fix interrupt test that flaked due to fallback

Bug: v8:11023
Change-Id: I0722338c6d82b665120f9ef8c7076e0c4983b4c2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2474773Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Martin Bidlingmaier <mbid@google.com>
Cr-Commit-Position: refs/heads/master@{#70533}

test/cctest/test-api.cc

@@ -21574,6 +21574,11 @@ TEST(RegExpInterruptAndReenterIrregexp) {
   i::FLAG_regexp_tier_up_ticks = 0;
   i::FLAG_regexp_interpret_all = false;
   i::FLAG_enable_experimental_regexp_engine = false;
+  // We want to be stuck in regexp execution, so no fallback to linear-time
+  // engine.
+  // TODO(mbid,v8:10765): Find a way to test interrupt support of the
+  // experimental engine.
+  i::FLAG_enable_experimental_regexp_engine_on_excessive_backtracks = false;
   RegExpInterruptTest test;
   test.RunTest(RegExpInterruptTest::ReenterIrregexp);
 }