JIT: Fix folding of GC pointer arithmetic in lowering #108838
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The TLS helper expansion would produce `ADD(long, int)` trees like ``` ▌ STORE_LCL_VAR long V01 rat0 └──▌ ADD long ├──▌ ADD long │ ├──▌ LCL_VAR long V02 rat1 │ └──▌ CNS_INT int 72 $41 └──▌ CNS_INT long 192 ``` which is not legal IR. Fix that by inserting a cast. Also do some more aggressive folding to get rid of these casts in the normal cases, and to fold some constant arithmeticf in other cases.
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area-CodeGen-coreclr
BruceForstall
approved these changes
Oct 21, 2024
EgorBo
approved these changes
Oct 21, 2024
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Fix #108830
Based on #108836 (to avoid regressions)