[wasm][coreclr] GetUnmanagedCallersOnlyThunk: unknown thunk for unmanaged callers only method

[radekdoulik]

Some runtime tests have methods decorated with UnmanagedCallersOnly attribute. These will require native relinking.

They fail like this:

11:48:33.449 Running test: JIT/opt/Regressions/Regression3_Regressions/Regression3_Regressions.dll
ASSERT FAILED
	Expression: false && "GetUnmanagedCallersOnlyThunk: unknown thunk for unmanaged callers only method"
	Location:   /__w/1/s/src/coreclr/vm/wasm/helpers.cpp:746
	Function:   GetUnmanagedCallersOnlyThunk
	Process:    42
Frame (InlinedCallFrame): 0x4fdc54
    Skipping 0x4fdc54
Frame (InterpreterFrame): 0x4fede8
   0) dynamicClass::IL_STUB_PInvoke, IR_004a
   1) System.Reflection.RuntimeAssembly::GetTypeCore, IR_015c
   2) System.Reflection.RuntimeAssembly::GetTypeCore, IR_006d
   3) System.Reflection.TypeNameResolver::GetType, IR_0278
   4) System.Reflection.TypeNameResolver::GetSimpleType, IR_00bb
   5) System.Reflection.TypeNameResolver::Resolve, IR_0018
   6) System.Reflection.TypeNameResolver::GetType, IR_0099
   7) System.Reflection.RuntimeAssembly::GetType, IR_002a
   8) System.Reflection.Assembly::GetType, IR_001b
   9) Program::TestEntryPoint, IR_002e
  10) Program::<<Main>$>g__TestExecutor134|0_135, IR_005b
  11) Program::<Main>$, IR_07b9

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