[PATCH] CodeGen support for x86_64 SEH catch handlers in LLVM

[Eric Christopher]

<insert offline discussion>

So, as we've discussed:

a) split out the enum changes,
b) split out moving the padmap construction
c) rebase

The first two are fairly obvious and fine, we'll then get to the review of the latter.

-eric


http://reviews.llvm.org/D6300

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