[RyuJIT] Introduce a general reverse copy prop for struct temps #8887
Description
We currently allocate a struct temp for the result of newobj or any function returning struct. In many cases that struct is immediately assigned to a local. We should perform reverse copy prop to get rid of the temp.
The relevant comment in the code is here
Related issues:
- System.ValueTuple causes a StackOverflow when used in a large Dictionary. #8980
- JIT: consider optimizing constructor pattern for struct creation #9237
- Extra copy of struct before return #38743
- CQ: Big Value Type Suboptimal Inlining Code Generation #39732
category:cq
theme:copy-prop
skill-level:intermediate
cost:medium