Duncan P. N. Exon Smith 23e56ecf26 AsmPrinter: Check subprogram before using it ...

Check return of `getDISubprogram()` before using it.  A WIP patch makes
`DIDescriptor` accessors more strict (and would crash on this).

llvm-svn: 232838

2015-03-20 19:50:00 +00:00

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