Merging r297403:
Merging r297403:

------------------------------------------------------------------------
r297403 | tstellar | 2017-03-09 14:24:07 -0500 (Thu, 09 Mar 2017) | 17 lines

CMake: Don't install llvm-tblgen twice

Summary:
The add_tablegen macros defines its own install target, and it was also calling
add_llvm_utility which adds another install target.

Configuring with -DLLVM_TOOLS_INSTALL_DIR set to something other than
'bin' along with -DLLVM_INSTALL_UTILS=ON was causing llvm-tablgen
to be installed to two separate directories.

Reviewers: beanz, hans

Reviewed By: beanz

Subscribers: llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D30656
------------------------------------------------------------------------

git-svn-id: 27e84c199cfb3049f109a3001c965f4b97b0bded@303413 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm