[Instruction] Add dropLocation and updateLocationAfterHoist helpers #1846
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Introduce a helper which can be used to update the debug location of an
Instruction after the instruction is hoisted. This can be used to safely
drop a source location as recommended by the docs.
For more context, see the discussion in https://reviews.llvm.org/D60913.
Differential Revision: https://reviews.llvm.org/D85670
(cherry picked from commit dfc5a9e)