[PATCH] D72938: Fix an assertion failure in DwarfExpression's subregister composition

[Adrian Prantl via Phabricator via llvm-commits]

aprantl created this revision.
aprantl added reviewers: vsk, djtodoro, markus, bjope.
aprantl added a project: debug-info.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

This patch fixes an assertion failure in DwarfExpression that is triggered when a complex fragment has exactly
the size of a subregister of the register the DBG_VALUE points to *and* there is no DWARF encoding for the super-register.

I took the opportunity to replace/document some magic values with static constructor functions to make this code less confusing to read.

rdar://problem/58489125


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72938

Files:
  llvm/lib/CodeGen/AsmPrinter/DwarfExpression.cpp
  llvm/lib/CodeGen/AsmPrinter/DwarfExpression.h
  llvm/test/DebugInfo/MIR/ARM/subregister-full-piece.mir

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