[clang] [llvm] [LLVMABI] Implement the System V X86-64 ABI (PR #194718)

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github-actions[bot] wrote:

<!--LLVM IDS CHECK COMMENT-->


:warning: LLVM ABI annotation checker, ids-check found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
Build idt from compnerd/ids, then for each changed header:
    idt -p build/ --main-file <matching-source.cpp> \
        --apply-fixits --inplace <header>
``````````

</details>

<details>
<summary>
View the diff from ids-check here.
</summary>

``````````diff
diff --git a/llvm/include/llvm/ABI/TargetInfo.h b/llvm/include/llvm/ABI/TargetInfo.h
index 8de18c494..82bb849eb 100644
--- a/llvm/include/llvm/ABI/TargetInfo.h
+++ b/llvm/include/llvm/ABI/TargetInfo.h
@@ -92,7 +92,7 @@ enum class X86AVXABILevel {
   AVX512,
 };
 
-std::unique_ptr<TargetInfo> createX86_64TargetInfo(TypeBuilder &TB,
+LLVM_ABI std::unique_ptr<TargetInfo> createX86_64TargetInfo(TypeBuilder &TB,
                                                    X86AVXABILevel AVXLevel,
                                                    bool Has64BitPointers,
                                                    const ABICompatInfo &Compat);
diff --git a/llvm/include/llvm/ABI/Types.h b/llvm/include/llvm/ABI/Types.h
index a3d5f0d91..f511f8137 100644
--- a/llvm/include/llvm/ABI/Types.h
+++ b/llvm/include/llvm/ABI/Types.h
@@ -313,7 +313,7 @@ public:
   /// Returns the field, base, or virtual base whose extent contains
   /// \p OffsetInBits, or nullptr if no such element exists. Empty bases and
   /// unnamed bitfields are skipped.
-  const FieldInfo *getElementContainingOffset(unsigned OffsetInBits) const;
+  LLVM_ABI const FieldInfo *getElementContainingOffset(unsigned OffsetInBits) const;
 
   static bool classof(const Type *T) {
     return T->getKind() == TypeKind::Record;

``````````

</details>


https://github.com/llvm/llvm-project/pull/194718