Fix warning from r332654 with LLVM_ATTRIBUTE_USED

r332654 tried to fix an unused function warning with
a void cast. This approach worked for clang and gcc 
but not for MSVC. This commit replaces the void cast
with the LLVM_ATTRIBUTE_USED approach.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332910 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed