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Commit 597e81de authored by Reid Kleckner's avatar Reid Kleckner
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-fms-extensions: Add __va_start builtin, which is used for x64

The main difference between __va_start and __builtin_va_start is that
the address of the va_list has already been taken, and the va_list is
always a char*.

__va_end and __va_arg are not needed.

llvm-svn: 204821
parent c491a8d4
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