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After register coalescing, some `DBG_VALUE`s can have incorrect info. For example, if a `DBG_VALUE` has a register operand `%0`, but it resides in a live range of `%1`, it has incorrect info after `%0` and `%1` are coalesced. See the comments for more details. This does not have meaningful changes on our variable debug info coverage or compilation time, which is good news. Reviewed By: dschuff Differential Revision: https://reviews.llvm.org/D151125