Fix the build of GlobalISelEmitter with MSVC 2017 by specializing earlier

MSVC doesn't seem to like implicitly instantiating addPredicate and then
explicitly specializing it later. It causes an internal compiler error.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315930 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed