Commits on Nov 13, 2021

1. Make more extensive use of lvaGetDesc() …

   Including the version with a `GenTreeLclVarCommon*` overload.
   
   I mostly replaced `&lvaTable[varNum]` and `lvaTable + varNum`
   expressions, leaving `lvaTable[varNum].xxx`.
   
   Made many resulting `varDsc*` const.
   
   Removed unused `lvaRefCount`.
   
   Simplifies code, and centralizes assert checking.
   
   Added new `lvaGetLclNum(LclVarDsc*)` function to map back to a varNum.
   
   This deletes many `noway_assert` in favor of the lvaGetDesc `assert`;
   I'm not worried about removing asserts from the Release build.

   

   BruceForstall committed Nov 13, 2021
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