[runtime] First step to sanitize regexp literal creation.

[runtime] First step to sanitize regexp literal creation.

This is the initial step towards refactoring the regexp literation
creation code to make it less obscure and more similar to the mechanism
we use to create array and object literals.  There's now a new runtime
entry %CreateRegExpLiteral with the same interface as the entries for
array and object literals, except that we still pass the flags as
string.

Instead of embedding the hand written native to clone JSRegExp instances
we now have a FastCloneRegExpStub, which behaves similar to the other
FastCloneShallowArrayStub and FastCloneShallowObjectStub that we already
had.

R=mlippautz@chromium.org, yangguo@chromium.org

Committed: https://crrev.com/09b44428e4d37ce3b8264148bef5ff4b156d47df
Cr-Commit-Position: refs/heads/master@{#32255}

[Benedikt Meurer, 2015-11-25 08:44:23]

bmeurer@chromium.org changed reviewers:
+ oth@chromium.org

[Benedikt Meurer, 2015-11-25 08:44:23]

Michael: Please check changes to heap.
Orion: Please check changes to interpreter.
Yang: Please review overall

[Michael Lippautz, 2015-11-25 08:49:02]

heap/ lgtm

[oth, 2015-11-25 08:58:39]

interpreter lgtm. code shinkage great.

[Yang, 2015-11-25 09:06:10]

LGTM! Awesome.

https://codereview.chromium.org/1475823003/diff/1/src/code-stubs-hydrogen.cc
File src/code-stubs-hydrogen.cc (right):

https://codereview.chromium.org/1475823003/diff/1/src/code-stubs-hydrogen.cc#...
src/code-stubs-hydrogen.cc:441: // so that it doesn't build and eager frame.
Haha! Found typo "build an eager frame" :)

[Benedikt Meurer, 2015-11-25 09:17:20]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-11-25 09:17:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1475823003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1475823003/1

[commit-bot: I haz the power, 2015-11-25 09:22:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-25 09:23:39]

Patchset 1 (id:??) landed as
https://crrev.com/09b44428e4d37ce3b8264148bef5ff4b156d47df
Cr-Commit-Position: refs/heads/master@{#32255}