Reland "A64: Now that we have veneers, fix a couple of branches to directly jump to their target."

Reland "A64: Now that we have veneers, fix a couple of branches to directly jump to their target."

This was reverted by revision 20187.

make -j45 arm64.release.check TESTFLAGS=--time TESTJOBS=mozilla/js1_5/Regress/regress-280769-2


Without the patch:
--- Total time: 00:07.039 ---
   1 (00:07.016) mozilla/js1_5/Regress/regress-280769-2
   2 (00:01.814) mozilla/js1_5/Regress/regress-280769-2
   3 (00:01.812) mozilla/js1_5/Regress/regress-280769-2

With the patch:
--- Total time: 00:12.252 ---
   1 (00:12.226) mozilla/js1_5/Regress/regress-280769-2
   2 (00:04.217) mozilla/js1_5/Regress/regress-280769-2
   3 (00:04.213) mozilla/js1_5/Regress/regress-280769-2

[ulan, 2014-04-14 12:15:20]

On 2014/04/14 12:09:42, Alexandre Rames wrote:

Do you know how this affects octane/regexp benchmark?

[Alexandre Rames, 2014-04-14 12:35:57]

On 2014/04/14 12:15:20, ulan wrote:
> On 2014/04/14 12:09:42, Alexandre Rames wrote:
> 
> Do you know how this affects octane/regexp benchmark?

Good point. This shows a ~8% performance penalty, so maybe it is better not to
push it.
I note that I should profile the regexp benchmark once we have 'perf', so I can
check there are no other sites where we would do better without veneers.