PATCH: error on code that redeclares with an __asm__ label after the first ODR use

[Nick Lewycky via cfe-commits]

PR22830 shows a case where some code was adding an __asm__ label after the
first use of a function. GCC and Clang diverged on this code, GCC emitting
the name in the last __asm__ label for all uses while clang would switch in
the middle of the TU as the redeclaration was parsed. The attached patch
detects this case and issues an error on such a redeclaration. If this
breaks real code, we can turn it down to a warning.

Please review!

Nick
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