Saleem Abdulrasool d0807aee51 CodeGen: correct Windows ARM C++ assertion ...

Because the Decl is explicitly passed as nullptr further up the call chain, it
is possible to invoke isa on a nullptr, which will assert.  Guard against the
nullptr.

Take the opportunity to reuse the helper method rather than re-implementing this
logic.

llvm-svn: 259874

2016-02-05 04:12:40 +00:00

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