[PATCH] Allow misaligned stores in x86 fast-isel

[Jim Stichnoth]

In X86FastISel::X86SelectStore(), improperly aligned stores are rejected
and handled by the DAG-based ISel.  However, X86FastISel::X86SelectLoad()
makes no such requirement.  There doesn't appear to be an x86 architectural
correctness issue with allowing potentially unaligned store instructions.

The attached patch removes this restriction.

Jim
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