[AArch64][PAC] Rework discriminator analysis for calls and tail calls Make use of fixupBlendComponents for AUTH_TCRETURN[_BTI] and for BLRA[_RVMARKER] pseudos the same way it is done for AUT/PAC/AUTPAC. This patch unifies discriminator analysis for DAGISel and GlobalISel and improves cross-BB analysis in case of DAGISel.
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