Move NumberToStringStub::GenerateLookupNumberStringCache to the MacroAssembler.

Move NumberToStringStub::GenerateLookupNumberStringCache to the MacroAssembler.

This renames the method to LookupNumberStringCache() and puts it into
the MacroAssembler in preparation of the NumberToStringStub Hydrogen
conversion.

R=mvstanton@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=16806

[Benedikt Meurer, 2013-09-18 11:08:43]

Hey Michael,
As discussed offline, I've split the NumberToStringStub conversion CL into
separate CLs. This is the first part, which simply moves the
LookupNumberStringCache() method to the MacroAssembler. Straight forward.
PTAL
-- Benedikt

[mvstanton, 2013-09-18 15:59:17]

A very nice re-arrangement :^). lgtm.

[Benedikt Meurer, 2013-09-19 06:07:38]

Committed patchset #1 manually as r16806 (presubmit successful).