Revert "Revert "Reland 21774: Generate KeyedLoadGeneric with Hydrogen""

Revert "Revert "Reland 21774: Generate KeyedLoadGeneric with Hydrogen""

This CL tickled an unrelated arm64 bug which was is fixed separately.

The MIPS port (originally landed 21784) is also included.

TBR=verwaest@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=21803

[danno, 2014-06-12 09:58:33]

Committed patchset #1 manually as r21803 (presubmit successful).

[Toon Verwaest, 2014-06-12 09:58:48]

(rubberstamp) lgtm

[mtbrandy, 2014-06-17 13:45:40]

This change introduces issues on big endian platforms.  See inline comments.

https://codereview.chromium.org/331633002/diff/1/src/hydrogen-instructions.h
File src/hydrogen-instructions.h (right):

https://codereview.chromium.org/331633002/diff/1/src/hydrogen-instructions.h#...
src/hydrogen-instructions.h:6094: STATIC_ASSERT((Map::kInstanceTypeOffset & 1)
== 0);
These asserts are invalid on big endian platforms.

https://codereview.chromium.org/331633002/diff/1/src/objects.h
File src/objects.h (left):

https://codereview.chromium.org/331633002/diff/1/src/objects.h#oldcode6731
src/objects.h:6731: STATIC_ASSERT(kInstanceTypeOffset ==
Internals::kMapInstanceTypeOffset);
This change introduces a mismatch between kInstanceTypeOffset and
Internals::kMapInstanceTypeOffset on big endian platforms.

[Paul Lind, 2014-06-17 15:41:21]

On 2014/06/17 13:45:40, mtbrandy wrote:
> This change introduces issues on big endian platforms.  See inline comments.

I have a fix for this in https://codereview.chromium.org/334403003/ PTAL, and
add any comments, suggestions.