[MIR] Fix MIR trans edge cases that showed up on crater.#34128

Merged

bors merged 3 commits intorust-lang:masterfrom

eddyb:mir-trans-fixes

Jun 7, 2016

Commits on Jun 6, 2016

Commits on Jun 7, 2016

trans: don't create allocas anywhere other than the entry block.
eddyb
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