MIPS: Refactor and improve inlined double-aligned allocations

Additionally, fix object size register clobbering in Allocate routine.

Based on 13284 (d42bf80).

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/22582002

Patch from Dusan Milosavljevic <Dusan.Milosavljevic@rt-rk.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16112 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
tweak of Math.abs in its x64 stub

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/22285003

Patch from Weiliang Lin <weiliang.lin@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16113 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Patch to enhance the source code line information for profiler.

This patch is to enhance the source code line information for profiler.

For the Hydrogen compilation, most of the source code line information
is not copied from the HInstruction the to corresponding LInstruction.

This patch defines one PositionBits field for LInstruction and copies the
sorce code position value from the HInstruction.

When Generating the native code, we use RecordPosition(..) function to
write LInstruction's position value to position recorder.

For the MIPS platform, I did not touch because I have no devices
to verify the modification on it.

R=danno@chromium.org

Review URL: https://codereview.chromium.org/21042003

Patch from Chunyang Dai <chunyang.dai@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16114 ce2b1a6d-e550-0410-aec6-3dcde31c8c00