Enhance fix of PR17631

[Michael Liao]

Kindly ping in case it's missing during the long weekend. Patch is
re-attached.

Yours
- Michael

On Sat, 2013-11-30 at 00:09 -0800, Michael Liao wrote:
> Hi All,
> 
> It's turned out that a previous fix to PR17631 is not enough to cover
> cases where 'CALL' need special handling for 'vzeroupper' insertion. In
> addition to helper calls added in prolog, helper calls (not following
> any well-defined calling convention) may be also inserted other places,
> such as '_ftol2' for double-to-i64 conversion in Windows. The attached
> patch enhances the previous fix by checking if the call will clobber any
> YMM registers after checking that 'call' won't touch YMMs. It will cover
> the cases where isel-lower inserts helper calls not following standard
> calling convention.
> 
> Thanks for review
> - Michael
> 
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