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be488ff93c
Follow up to D101357 / 3fa6510f6.
Supersedes D102330.
Goal: Use flags setting rdffrs instead of rdffr + ptest.
Problem: RDFFR_P doesn't have have a flags setting equivalent.
Solution: in instcombine, canonicalize to RDFFR_PP at the IR level, and
rely on RDFFR_PP+PTEST => RDFFRS_PP optimization in
AArch64InstrInfo::optimizePTestInstr.
While here:
* Test that rdffr.z+ptest generates a rdffrs.
* Use update_{test,llc}_checks.py on the tests.
* Use sve attribute on functions.
Differential Revision: https://reviews.llvm.org/D102623
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