[llvm-commits] Add support for VarArg function calls

[Jush Lu]

*Hi,

This patch turns on VarArg function calls for ARMFastISel, and I only
modified few lines of code in this patch, because variadic function calls
use base standard calling convention to pass arguments and return results, that
means a variadic function call works as noraml function calls, All we need
to do is to avoid using co-processor registers to pass arguments and
results, then variadic function calls will work well.

I've got commit access and I would like to commit this patch, please help
me review, thanks.

Jush*
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