Adrian Prantl ab255fcd09 Cleanup: Calls to getDwarfRegNum() may actually fail, if there is ...

no DWARF register number mapping, or if the register was a virtual
register that was never materialized. Previously, we would just emit a
bogus location, after this patch we don't emit a location at all by
doing an early exit.

After my bugfix in r223401 today, this doesn't actually happen on any
target that I tested this with, but it's still preferable to make the
possibility of a failure explicit.

llvm-svn: 223428

2014-12-05 01:02:46 +00:00

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