__sys builtin support for AArch64 (#146456) Adds support for __sys Clang builtin for AArch64 __sys is a long existing MSVC intrinsic used to manage caches, tlbs, etc by writing to system registers: * It takes a macro-generated constant and uses it to form the AArch64 SYS instruction which is MSR with op0=1. The macro drops op0 and expects the implementation to hardcode it to 1 in the encoding. * Volume use is in systems code (kernels, hypervisors, boot environments, firmware) * Has an unused return value due to MSVC cut/paste error Implementation: * Clang builtin, sharing code with Read/WriteStatusReg * Hardcodes the op0=1 * Explicitly returns 0 * Code-format change from clang-format * Unittests included * Not limited to MSVC-environment as its generally useful and neutral
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