[CMake] Fix llvm_setup_rpath function
Summary:
Set _install_rpath to CMAKE_INSTALL_RPATH if it is defined, so that eventually
INSTALL_RPATH is set to CMAKE_INSTALL_RPATH.
The "if(NOT DEFINED CMAKE_INSTALL_RPATH)" was missing a corresponding else
clause.
This also cleans up the fix made in r285908.
Patch by Azharuddin Mohammed
Reviewers: john.brawn, sgundapa, beanz
Subscribers: chapuni, mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D26289
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286184
91177308-0d34-0410-b5e6-
96231b3b80d8
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