Have the profiler load the correct registers on x64.
Have the profiler load the correct registers on x64.

This is still not correct, since internally they are kept as an int.
Use our new V8_HOST_ARCH macros for detecting the host processor.

Review URL: http://codereview.chromium.org/109025


git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@1879 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh