[wasm][coreclr] unbox.any.generic is failing in interpreter test

[radekdoulik]

This will be fixed the same way as unbox.any in #120261

It fails like this

Test castclass with shared generics (string)
ASSERT FAILED
        Expression: pILTargetMethod != NULL
        Location:   line 418 in /Users/rodo/git/runtime-main/src/coreclr/vm/interpexec.cpp
        Function:   GetPossiblyIndirectHelper
        Process:    42
Frame (InterpreterFrame): 0x4fecac
   0) InterpreterTest::TestSharedGenerics_UnboxAny, IR_0007
   1) InterpreterTest::TestSharedGenerics, IR_0116
   2) InterpreterTest::RunInterpreterTests, IR_05d5
   3) InterpreterTest::Main, IR_0029
Aborted(Runtime error: The application has corrupted its heap memory area (address zero)!)
/Users/rodo/git/runtime-main/artifacts/obj/coreclr/browser.wasm.Debug/hosts/corerun/corerun.js:144
      throw ex;

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[radekdoulik]

Fixed by #120261