[NFC] Separate high-level-dependent portions of DWARFExpression (revised) (#143170) (Revised version of a previous, unreviewed, PR.) Move all expression verification into its only client: DWARFVerifier. Move all printing code (which was a mix of static and member functions) into a separate class. This is one in a series of refactoring PRs to separate dwarf functionality into lower-level pieces usable without object files and sections at build time. The code is already written this way via various "if (section == nullptr)" and similar conditionals. So the functionality itself is needed and exists, but only as a runtime feature. The goal of these refactors is to remove the build-time dependencies, which will allow the existing functionality to be used from lower-level parts of the compiler. Particularly from lib/MC/.... More information at: https://discourse.llvm.org/t/rfc-debuginfo-dwarf-refactor-into-to-lower-and-higher-level-libraries/86665
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