Changes

Summary

1. [Hexagon] Silence warnings about unused objects (details)
2. Frontend: Use a getVirtualFileRef for a named pipe main file, NFC (details)

Commit e3b2828b9d6d44c657f7feb0fd472773d0fdd671 by kparzysz [Hexagon] Silence warnings about unused objects
	llvm/lib/Target/Hexagon/HexagonVectorCombine.cpp
Commit 347e1f621355d9b58901f3579fde91783c24ca29 by Duncan P. N. Exon Smith Frontend: Use a getVirtualFileRef for a named pipe main file, NFC
	clang/lib/Frontend/CompilerInstance.cpp