[mini] gshared: Implement static virtual method `constrained.ldftn` in the JIT

[lambdageek]

See

runtime/src/mono/mono/mini/method-to-ir.c

Lines 11113 to 11115 in 9a9a4f3

	if (m_method_is_static (cmethod) && mini_class_check_context_used (cfg, constrained_class))
	// FIXME:
	GENERIC_SHARING_FAILURE (CEE_LDFTN);

Contributes to #49904

[lambdageek]

Fixed by #66739