Reid Kleckner 9f52049132 x86: Fix large model calls to __chkstk for dynamic allocas
In the large code model, we now put __chkstk in %r11 before calling it.

Refactor the code so that we only do this once. Simplify things by using
__chkstk_ms instead of __chkstk on cygming. We already use that symbol
in the prolog emission, and it simplifies our logic.

Second half of PR18582.

llvm-svn: 227519
2015-01-29 23:58:04 +00:00
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