Not all code-paths set the relocation model to static for Windows. This
currently breaks on Windows ARM with `-mlong-calls` when built with clang.
Loosen the assertion to what it was previously. We would ideally ensure that
all the configuration sets Windows to static relocation model.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274570 91177308-0d34-0410-b5e6-96231b3b80d8