[clang] [compiler-rt] [llvm] [X86] Hygon C86-4G-M8 Initial enablement (PR #204587)

[Phoebe Wang via cfe-commits]

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+//=- X86ScheduleC864GM8.td - X86 C86-4G-M8 Scheduling --------*- tablegen -*-=//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the machine model for C86-4G-M8 to support instruction
+// scheduling and other instruction cost heuristics.
+//
+//===----------------------------------------------------------------------===//
+
+def C864GM8Model : SchedMachineModel {
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phoebewang wrote:

Does it have any difference compare with C764GM8Model? Do not duplicate if not.

https://github.com/llvm/llvm-project/pull/204587