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Drop ABSL_RANDOM_HWAES_FLAGS compiler flags
Older CPUs that do not have SSE4.1 would crash with the Ruby native gem due to an illegal instruction exception. The Abseil random library isn't being used at the moment (#26476), and there's no reason gRPC needs to force SSE4.1 instructions on all platforms at the moment. There are other hardware-specific issues that need to be ironed out for this to work: #27095 When the `-msse4` compiler flag was enabled, the Abseil code started using the `pinsrb` instruction: ``` $ elfx86exts abseil-cpp/absl/time/internal/cctz/src/time_zone_libc.o MODE64 (ret) CMOV (cmovne) SSE2 (movdqa) SSE41 (pinsrb) SSE1 (movaps) CPU Generation: Penryn ``` Closes #27095
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