[AArch64][SME][SDAG] Add basic support for exception handling (#159363) This patch adds basic support for exception handling to SelectionDAG for ZT0, ZA, and agnostic ZA state. This works based on the following assumptions: - To throw an exception requires calling into the runtime * The which will be a private ZA call (that commits the lazy save) - Therefore, as noted in https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst#exceptions we will always enter the EH block with PSTATE.ZA=0 and TPIDR2_EL0=null, so we can emit a restore of ZA/ZT0. Note: This patch does not handle all cases yet. Currently, there is no support for committing agnostic ZA state before `invoke`s, regardless of whether the callee is also agnostic (to ensure ZA state is saved on all normal returns).
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