[PATCH] Don't Promote Args for Variadic Functions

[Thomas Jablin]

Hi joerg,

Don't promote arguments for variadic functions. It can cause problems when arguments switch from being passed in on the stack to being passed in registers and the stack size is already baked-in.

http://reviews.llvm.org/D5055

Files:
  lib/Transforms/IPO/ArgumentPromotion.cpp
  test/Transforms/ArgumentPromotion/variadic.ll
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