Verfies that D27549 (partial fix for PR26619) produces IR that llvm can
translate to the expected DWARF.
Prior to the change "DebugInfo: New metadata representation for global
variables." (D20147, D20415), clang emitted debug metadata for static
const values of floating-point types, but llvm did not translate this
debug metadata into DWARF. After that change, clang did not emit debug
metadata for static const values of floating-point types, but llvm is
capable of translating it into DWARF if it is emitted.
Can you wrap this to 80 columns? clang-format can do this for you.