Load/Store cannot handle double representation.

Load/Store cannot handle double representation.

Assert that the representation for Load/Store in the X64 MacroAssembler
is never Double. Also add missing test case for the Load/Store macros.

TEST=cctest/test-macro-assembler-x64
R=mvstanton@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=17135

Committed: https://code.google.com/p/v8/source/detail?r=17151

[Benedikt Meurer, 2013-10-04 09:37:39]

Hey Michael,
Missing from that previous CL. PTAL
-- Benedikt

[mvstanton, 2013-10-10 11:41:08]

lgtm

[Benedikt Meurer, 2013-10-10 11:42:13]

Committed patchset #1 manually as r17135 (presubmit successful).

[Benedikt Meurer, 2013-10-11 07:12:11]

Committed patchset #1 manually as r17151 (presubmit successful).