Sort includes + include a missing `extern "C"` header

If we don't include Initialization.h,
`LLVMInitializeAggressiveInstCombiner` won't see its `extern "C"` decl.
This causes sadness, name mangling, and linker errors.

Reported on the mailing lists by Vladimir Vissoultchev. Thanks!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336736 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed