[NVPTX] Fix mis-use of CurrentFnSym in NVPTXAsmPrinter.  This was causing a symbol name error in the output PTX.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182298 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed