[regexp] Add 'l' flag to force experimental engine
This commit adds the 'l' (linear) RegExp flag (as in e.g. /asdf|123/l) that forces execution in linear time. These regexps are handled by the experimental engine. If the experimental engine cannot handle the pattern, an exception is thrown on creation of the regexp. The commit also adds a new global V8 flag and changes an existing one: * --enable-experimental-engine, which turns on recognition of the RegExp 'l' flag. Previously this flag also caused all supported regexps to be executed by the experimental engine; this is not the case anymore. * --default-to-experimental-regexp-engine takes over the previous semantics of --enable-experimental-regexp-engine: We execute all supported regexps with the experimental engine. Cq-Include-Trybots: luci.v8.try:v8_linux64_fyi_rel_ng Bug: v8:10765 Change-Id: I5622a89b19404105e8be280d454e9fdd63c003b3 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2461244Reviewed-by:Ulan Degenbaev <ulan@chromium.org> Reviewed-by:
Georg Neis <neis@chromium.org> Reviewed-by:
Simon Zünd <szuend@chromium.org> Reviewed-by:
Jakob Gruber <jgruber@chromium.org> Commit-Queue: Martin Bidlingmaier <mbid@google.com> Cr-Commit-Position: refs/heads/master@{#70892}
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