[DLCov] Implement DebugLoc coverage tracking (#107279) This is part of a series of patches that tries to improve DILocation bug detection in Debugify; see the review for more details. This is the patch that adds the main feature, adding a set of `DebugLoc::get<Kind>` functions that can be used for instructions with intentionally empty DebugLocs to prevent Debugify from treating them as bugs, removing the currently-pervasive false positives and allowing us to use Debugify (in its original DI preservation mode) to reliably detect existing bugs and regressions. This patch does not add uses of these functions, except for once in Clang before optimizations, and in `Instruction::dropLocation()`, since that is an obvious case that immediately removes a set of false positives.
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