[PATCH] Fix VGATHER operand constraints

[Michael Liao]

Hi,

This patch adds 'earlyclobber' constraints on VGATHER* output operands
to prevent its input registers being allocated as the output register.
According to the spec[1], "If any pair of the index, mask, or
destination registers are the same, this instructions results a UD
fault." With this constraint, RA could assign the same physical reg when
MASK or SRC in 'undef'.

Thanks for review
- Michael
------------------------
[1] http://software.intel.com/sites/default/files/319433-014.pdf
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