[roll] Roll llvm-project/libc [libc] Initial support for darwin-aarch64. Add initial support for darwin-aarch64 (macOS M1). Some differences compared to linux-aarch64: - `math.h` defined `math_errhandling` by the compiler builtin `__math_errhandling()` but Apple Clang 13.0.0 on M1 does not support `__math_errhandling()` builtin as a macro function or a constexpr function. - `math.h` defines `UNDERFLOW` and `OVERFLOW` macros. - Besides 5 usual floating point exceptions: `FE_INEXACT`, `FE_UNDERFLOW`, `FE_OVERFLOW`, `FE_DIVBYZERO`, and `FE_INVALID`, `fenv.h` also has another floating point exception: `FE_FLUSHTOZERO`. The corresponding trap for `FE_FLUSHTOZERO` in the control register is at the different location compared to the status register. - `FE_FLUSHTOZERO` exception flag cannot be raised with the default CPU floating point operation mode. Reviewed By: sivachandra Differential Revision: https://reviews.llvm.org/D120914 GitOrigin-RevId: 29f2b2da1646ec521974631b325d392d8c933215 Original-Revision: b43bd0b14bd9fe60b6df2b174b3c00cead4de1ff Change-Id: I798fe892395098b77aa4ede01200fe4d680143d2
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