SaveCallerSaveRegsisters needs to save all caller-save registers

SaveCallerSaveRegsisters needs to save all caller-save registers

While the macro assembler uses them as scratch registers, we need to
save them when calling out to builtins. In debug mode, the simulator
will clobber all registers after a call to a builtin which makes
regress-119926.js crash.

BUG=none
R=rodolph.perfetta@arm.com, ulan@chromium.org
LOG=n

Committed: https://code.google.com/p/v8/source/detail?r=18879

[jochen (gone - plz use gerrit), 2014-01-28 12:47:00]

ptal

[ulan, 2014-01-28 13:11:48]

lgtm

[Rodolph Perfetta (ARM), 2014-01-28 13:24:57]

Nice catch. x8 and x9 used to be temp in the macro assembler. Not anymore.

lgtm with nit addressed.

https://codereview.chromium.org/148273008/diff/20001/src/a64/code-stubs-a64.h
File src/a64/code-stubs-a64.h (right):

https://codereview.chromium.org/148273008/diff/20001/src/a64/code-stubs-a64.h...
src/a64/code-stubs-a64.h:317: // SaveCallerRegisters method needs to save caller
saved register, howeve
nit: however

[jochen (gone - plz use gerrit), 2014-01-28 13:29:26]

Committed patchset #3 manually as r18879 (presubmit successful).