[llvm-commits] sret-demotion for large struct returns working on x86!

[Kenneth Uildriks]

Here's the updated version of the patch:

1. Moved the flag and demote register from MachineFunction to
FunctionLoweringInfo
2. Inverted CantLowerReturn to CanLowerReturn while carrying out #1
3. Now passing the return Attributes to getReturnInfo and using its
ZExt and SExt flags properly.
4. Cleaned up braces.

New testcase coming as soon as I figure out how to get svn diff or
mkpatch to pick up a brand-new file.
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