Use weak cells to embed maps in store handler.

BUG=v8:3629
LOG=N

Review URL: https://codereview.chromium.org/774473004

Cr-Commit-Position: refs/heads/master@{#25639}
Simplify template literal raw string creation

BUG=v8:3710
LOG=Y
R=dslomov@chromium.org, marja@chromium.org

Review URL: https://codereview.chromium.org/768203002

Cr-Commit-Position: refs/heads/master@{#25640}
MIPS64: [turbofan] Add checked load/store operators.

Port c516d4f09408879602520748333754d3866224fb

BUG=

Review URL: https://codereview.chromium.org/773113005

Cr-Commit-Position: refs/heads/master@{#25641}
Move more don't-crankshaft computation to numbering pass

The "do I inline?" decision needs many of the same inputs as the "should
I even try to crankshaft?" decision.  This change consolidates these
checks in the numbering pass.  It also removes the is_generator() check,
as that's already handled when visiting the initial Yield expression.

R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/775693003

Cr-Commit-Position: refs/heads/master@{#25642}
Revert "[turbofan] Reuse forward fixpoint algorithm in Typer by making it a Reducer."

This reverts commit a48ad24a7c258d95acf3a6ae126036953a9122dd.

BUG=

Review URL: https://codereview.chromium.org/763773004

Cr-Commit-Position: refs/heads/master@{#25643}