Commits on Apr 8, 2021

1. Speed up registration of stack maps …

   This commit fixes a perf issue I was seeing in some local benchmarking
   where registration of stack maps took a nontrivial amount of time for a
   module that didn't even use stack maps! The fix here is to largely just
   do the same thing as bytecodealliance#2811 which is to use the in-memory data structures
   of a `CompiledModule` rather than rebuilding different data structures
   when a module is registered with a `Store`.
   
   The `StackMapRegistry` type now takes a lookup object for a range of
   pcs, simplifying registration. Registration additionally doesn't even
   happen if a module is pre-determined to not have any stack maps inside
   of it. This trait object encapsulates all the logic that was previously
   used in the rebuilt data structures and also leverages conveniences like
   `CompiledModule::func_by_pc` added recently as well.
   
   With this all combined it means that modules which don't have stack maps
   now skip this registration step entirely and modules with stack maps
   should do much less work during registration as well.

   

   alexcrichton committed Apr 8, 2021
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