Michael Gottesman 5d984de9ec [cmake] Instead of setting LLVM_TABLEGEN_EXE, use our own SWIFT_TABLEGEN_EXE variable. ...

This eliminates us setting an LLVM_ prefixed variable in a situation where there is
a viable alternative.

We want to eliminate as many of these as possible since they can cause conflicts
with variables set in LLVMConfig.cmake.

I also added some convenience tablegen functions in AddSwiftTableGen.cmake and
changed all tblgen users to use that instead.

rdar://26154980

2016-06-24 17:18:45 -07:00

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