[LLVMdev] Merge-Cha-Cha

[Bill Wendling]

As you all have undoubtedly noticed, I recently did Yet Another Merge
to Apple's GCC top-of-tree. This merge was prompted by several
important fixes in the "blocks" implementation. There are still many
testcases that need to be moved over, but those can come at our
leisure. I compiled both the "Apple way" and the "FSF way". It also
passed the tests in llvm-test/Multitest. It should be a good merge,
but let me know if things break for you.

-bw