Chris Lattner 35096e82c5 Fix PR7054 - Assertion `Symbol->isUndefined() && "Cannot define a symbol twice!"' failed. ...

Users can write broken code that emits the same label twice with asm renaming,
detect this and emit a fatal backend error instead of aborting.

llvm-svn: 103140

2010-05-06 00:05:37 +00:00

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