Issue 146936
Summary [AArch64] VG is not correctly saved on Darwin targets when switching to/from streaming mode
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Reporter efriedma-quic
    334a366ba792adb41ccf43457b65ac88aa37f178 disables saving VG if the target is Darwin, and doesn't have SVE support. This is problematic: if future Apple hardware ever enables SVE support, unwind will break because the unwinder won't know the current VG.

@aemerson @jroelofs @MacDue @sdesmalen-arm 
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