[AArch64] [test] Move tests for custom unwind opcodes to a separate function These custom opcodes disable the checker for having the prologue length actually match the opcodes (see checkARM64Instructions in MCWin64EH.cpp) - which led to the prologue mismatching the opcodes by one instruction, since 312d6b488ef9d7c0e4d649827820db7285e36406. Move the special opcodes to a separate test function. Remove the mismatched nop instruction at the end of the main function, as this prologue now is assembled with the strict length checking enabled.
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