Revert of Revert of X87: Reimplement Maps and Sets in JS (patchset #1 id:1 of https://codereview.chromium.org/
1073723002/)
Reason for revert:
Revert the revert as this commit cannot be the cause for the closed tree.
Original issue's description:
> Revert of X87: Reimplement Maps and Sets in JS (patchset #1 id:1 of https://codereview.chromium.org/
1066373002/)
>
> Reason for revert:
> Reverting as it resulted in a closed waterfall.
>
> Original issue's description:
> > X87: Reimplement Maps and Sets in JS
> >
> > port
909500aa1db9789b68e101045a6359a7fcb30e83 (r27605)
> >
> > original commit message:
> > Previously, the only optimized code path for Maps and Sets was for String keys.
> > This was achieved through an implementation of various complex operations
> > in Hydrogen. This approach was neither scalable nor forward-compatible.
> >
> > This patch adds the necessary intrinsics to implement Maps and Sets almost entirely
> > in JS. The added intrinsics are:
> >
> > %_FixedArrayGet
> > %_FixedArraySet
> > %_TheHole
> > %_JSCollectionGetTable
> > %_StringGetRawHashField
> >
> > With these additions, as well as a few changes to what's exposed as runtime functions,
> > most of the C++ code backing Maps and Sets is gone (including both runtime code in
> > objects.cc and Crankshaft in hydrogen.cc).
> >
> > BUG=
> >
> > Committed: https://crrev.com/
56600a35a49ffa5abcba66b14839089de3589ad9
> > Cr-Commit-Position: refs/heads/master@{#27681}
>
> TBR=weiliang.lin@intel.com,chunyang.dai@intel.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=
>
> Committed: https://crrev.com/
a0486f128109443ed07802fb463c267e53533d81
> Cr-Commit-Position: refs/heads/master@{#27682}
TBR=weiliang.lin@intel.com,chunyang.dai@intel.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=
Review URL: https://codereview.chromium.org/
1077543002
Cr-Commit-Position: refs/heads/master@{#27685}