Remove IR scenario tests.

These are a burden to maintain & use hand crafted IR to test particular DWARF
generation cases in LLVM. If someone thinks there's high value coverage here
they can rephrase these as IR+dwarfdump tests in the LLVM regression suite so
they'll be portable/easily executed by all developers.

llvm-svn: 177182
GitOrigin-RevId: 7e138ff572a0cf2cb75fad6bacbec4816fe98065
5 files changed