Introduce Push and Pop macro instructions for x64

Introduce Push and Pop macro instructions for x64

R=verwaest@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=20049

[haitao.feng, 2014-03-14 04:04:18]

Toon, please take a took.

64-bit CPU does not have native instructions to do 32-bit push/pop so we
simulate the 32-bit pushl/popl by manually manipulate the stack pointer.

[Toon Verwaest, 2014-03-17 15:16:19]

Seems like these instructions should be introduced at the macro-assembler level
rather than assembler. Can we make that PushP etc?

[haitao.feng, 2014-03-18 14:51:44]

Done. I extended the existing Push/Pop macro instruction as we already have them
to abstract push/pop a register with pointer size for different ports in
full-codegen.cc. I also moved push and pop to pushq and popq.

[Toon Verwaest, 2014-03-18 14:57:38]

Nice. LGTM

[haitao.feng, 2014-03-19 08:59:37]

Committed patchset #3 manually as r20049 (presubmit successful).