A64: Introduce 'branch types' that extend the architectural conditions.

A64: Introduce 'branch types' that extend the architectural conditions.

The branch types include 'always' and 'never', and types like reg_zero (CBZ) and
reg_bit_clear (TBZ).
This will be used by incoming improvements to the code generated for
deoptimization exit points.

R=ulan@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=19497

[Alexandre Rames, 2014-02-18 17:21:22]

This is a first step to improving the deoptimization exit sites. It will help
abstract the type of branch we want to perform for the different variants of
DeoptimizeIf (DeoptimizeIfNegative(register), etc.).

[Alexandre Rames, 2014-02-19 10:56:44]

https://codereview.chromium.org/170783002/diff/1/src/a64/macro-assembler-a64.h
File src/a64/macro-assembler-a64.h (right):

https://codereview.chromium.org/170783002/diff/1/src/a64/macro-assembler-a64....
src/a64/macro-assembler-a64.h:258: 
Moved as a global function outside of the MacroAssembler class, below the enum
definition.

[ulan, 2014-02-19 10:58:49]

Could you please reupload? The "side-by-side diffs" are empty.

[ulan, 2014-02-19 12:03:11]

lgtm

[Alexandre Rames, 2014-02-19 16:13:16]

Committed patchset #2 manually as r19497 (presubmit successful).