Silence the unused function warning in exception.cpp.

Rather than try to protect the function behind a precise,
ever-changing #if expression, just inline it into every caller.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@192077 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed