[llvm] [RISCV] Add more files to .github/CODEOWNERS (PR #65234)

[Craig Topper via llvm-commits]

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@@ -497,6 +497,7 @@ utils/bazel/llvm-project-overlay/libc/** @llvm/pr-subscribers-libc
 /llvm/**/*RISCV* @llvm/pr-subscribers-riscv
 /clang/**/*RISCV* @llvm/pr-subscribers-riscv
 /clang/include/clang/Basic/riscv_*.td @llvm/pr-subscribers-riscv
+/clang/lib/Headers/riscv_* @llvm/pr-subscribers-riscv
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topperc wrote:

@MaskRay Do you have a suggestion for what "core" for RISC-V should be?

https://github.com/llvm/llvm-project/pull/65234