[mono][aot] Use compile restart to emit a placeholder method body

[jandupej]

#91261 needs to emit a stand-in method body that only contains one throw in certain cases. This is currently done explicitly (method-to-ir.c: method_make_alwaysthrow_typeloadfailure), but after discussion with @vargaz a different approach might be more advantageous. Try and use compilation restart to emit that dummy method body.

[kotlarmilos]

Obsolete, lower priority compared to other tasks.