Commits on Apr 24, 2020

1. Add orig_insn_map: mapping from new to original insn indices. …

   This is needed in the Cranelift client code in order to track
   source-location mapping for debug info: we need to be able to shuffle
   the source locations into the new locations after the regalloc has done
   its instruction-stream editing. The `target_map` result is not quite
   good enough, because it only provides old --> new mappings at a basic
   block granularity.
   
   This commit also adds "invalid" values to the index types; this is
   useful to represent "new instruction maps to no old instruction" without
   the memory-layout waste of an `Option<u32>`.

   

   cfallin committed Apr 24, 2020
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