[WebAssembly] Use RefTypeMem2Local instead of Mem2Reg (#83196) When reference-types feature is enabled, forcing mem2reg unconditionally even in `-O0` has some problems described in #81575. This uses RefTypeMem2Local pass added in #81965 instead. This also removes `IsForced` parameter added in https://github.com/llvm/llvm-project/commit/890146b19206827bc48ee1ae1dc1534ff2ff18d7 given that we don't need it anymore. This may still hurt debug info related to reference type variables a little during the backend transformation given that they are not stored in memory anymore, but reference type variables are presumably rare and it would be still a lot less damage than forcing mem2reg on the whole program. Also this fixes the EH problem described in #81575. Fixes #81575.
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