[PATCH] ArgumentPromotion: Avoid invalidating the IR if a function's second argument is sret.

[Peter Collingbourne]

Hi rnk,

If the first argument to a function is a 'this' argument and the second
has the sret attribute, the ArgumentPromotion pass may promote the 'this'
argument to more than one argument, violating the IR constraint that 'sret'
may only be applied to the first or second argument. To avoid this, keep
track of the location of the argument and always move it to the front of
the argument list during promotion.

http://reviews.llvm.org/D10353

Files:
  lib/IR/Function.cpp
  lib/Transforms/IPO/ArgumentPromotion.cpp
  test/Transforms/ArgumentPromotion/sret.ll

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