Refactor loading a pointer into a register instruction for X64

Refactor loading a pointer into a register instruction for X64

R=verwaest@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=18479

[haitao.feng, 2013-11-07 13:54:35]

I use Move macro instruction to deal with a data whose size is kPointerSize. The
MoveInteger64 (https://codereview.chromium.org/64313002/), MoveDouble,
MoveReturnAddress (to be uploaded) are used for 64-bit data.

[haitao.feng, 2013-12-03 05:47:40]

Rebased with ToT. PTAL.

I will upload a CL to replace movq with movp at the right places after rebasing
X32 port with ToT.

[Toon Verwaest, 2013-12-04 09:52:56]

LGTM. The use of NONE64 is a bit odd given that Move (movp) will move a NONE32
on x32. Should we introduce a NONEP perhaps? We can defer this to a future CL
though.

[haitao.feng, 2013-12-04 12:12:51]

On 2013/12/04 09:52:56, Toon Verwaest wrote:
> LGTM. The use of NONE64 is a bit odd given that Move (movp) will move a NONE32
> on x32. Should we introduce a NONEP perhaps? We can defer this to a future CL
> though.
We could introduce a static function in X64 Assembler.
  static inline RelocInfo::Mode RelocInfoNone() {
    if (kPointerSize == kInt64Size) {
      return RelocInfo::NONE64; 
    } else {
      ASSERT(kPointerSize == kInt32Size);
      return RelocInfo::NONE32;
    }
  }

and replace RelocInfo::NONE64 with Assembler::RelocInfoNone(). I will submit
such a CL after committing this one.

[haitao.feng, 2014-01-08 07:02:21]

Committed patchset #2 manually as r18479 (presubmit successful).