Reverted due to large .debug_line size regressions for some
configurations; work currently in place to improve the output of this
behaviour in PR #108251.
This patch also modifies two tests that were created or modified after
the original commit landed and are affected by the revert:
llvm/test/CodeGen/X86/pseudo_cmov_lower2.ll
llvm/test/DebugInfo/X86/empty-line-info.ll
This reverts commit 5fef40c2c4.
51a29b5f16