[WASM] decompose.c:1471, condition `cfg->cbb == first_bb' not met

[jeromelaban]

Steps to Reproduce

public class Test<T>
{
	enum Operator { }
	private static bool TestMethod(Operator o) => throw new InvalidOperationException("test " + o);
}

Current Behavior

When AOT is enabled, as specific assembly fails with this message:

• Assertion at /mnt/jenkins/workspace/test-mono-mainline-wasm/label/ubuntu-1804-amd64/mono/mini/decompose.c:1471, condition `cfg->cbb == first_bb' not met

This happens on Wasm, but I've seen occasions where this happens when building for iOS as well.

On which platforms did you notice this

[ ] macOS
[x] Linux for Wasm
[ ] Windows

Version Used: af6d863