Matthias Braun 5e394c3d6f TargetPassConfig: Keep a reference to an LLVMTargetMachine; NFC ...

TargetPassConfig is not useful for targets that do not use the CodeGen
library, so we may just as well store a pointer to an
LLVMTargetMachine instead of just to a TargetMachine.

While at it, also change the constructor to take a reference instead of a
pointer as the TM must not be nullptr.

llvm-svn: 304247

2017-05-30 21:36:41 +00:00

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