Fix GCMetadaPrinter::finishAssembly not executed, patch by Yiannis Tsiouris.

Due to the execution order of doFinalization functions, the GC information were
deleted before AsmPrinter::doFinalization was executed. Thus, the
GCMetadataPrinter::finishAssembly was never called.

The patch fixes that by moving the code of the GCInfoDeleter::doFinalization to
Printer::doFinalization.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175528 91177308-0d34-0410-b5e6-96231b3b80d8