TargetRegisterInfo. DebugLocEntry now holds a buffer with the raw bytes
of the pre-calculated DWARF expression.
Ought to be NFC, but it does slightly alter the output format of the
textual assembly.
This reapplies 230930 with a relaxed assertion in DebugLocEntry::finalize()
that allows for empty DWARF expressions for constant FP values.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230975 91177308-0d34-0410-b5e6-96231b3b80d8