llvm-dwp: Handle GCC's use of multiple debug_types.dwo sections in a single .dwo file

(also includes the .test file missing from my previous commit, r265452)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265457 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed