[llvm-commits] Sink improvements

[Carlo Alberto Ferraris]

Please find attached a patch that improves the instrcution sinking pass 
so that it is able to handle things such as

a = ...
if (...) {
} else {
}
... = a // first use of a

I added a simple test for this (included in the patch) and make check 
does not report any regression (ubuntu x86 12.04).

B.r.,

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