[clang] [compiler-rt] [llvm] [AIX] Implement the ifunc attribute. (PR #153049)

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<!--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
git diff origin/main HEAD -- 'llvm/include/llvm/**/*.h' 'llvm/include/llvm-c/**/*.h' 'llvm/include/llvm/Demangle/**/*.h'
Then run idt on the changed files with appropriate --export-macro and --include-header flags.
``````````

:warning:
The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
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:warning:

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

``````````diff
diff --git a/llvm/include/llvm/CodeGen/TargetLoweringObjectFileImpl.h b/llvm/include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
index fb0422820..39588cad6 100644
--- a/llvm/include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
+++ b/llvm/include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
@@ -14,6 +14,7 @@
 #ifndef LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
 #define LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
 
+#include "llvm/Support/Compiler.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/BinaryFormat/XCOFF.h"
 #include "llvm/MC/MCExpr.h"
@@ -31,7 +32,7 @@ class MCSymbol;
 class Module;
 class TargetMachine;
 
-class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
+class LLVM_ABI TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
   bool UseInitArray = false;
   mutable unsigned NextUniqueID = 1;  // ID 0 is reserved for execute-only sections
   SmallPtrSet<GlobalObject *, 2> Used;
@@ -130,7 +131,7 @@ public:
   MCSection *getSectionForCommandLines() const override;
 };
 
-class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
+class LLVM_ABI TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
 public:
   TargetLoweringObjectFileMachO();
   ~TargetLoweringObjectFileMachO() override = default;
@@ -180,7 +181,7 @@ public:
   MCSection *getSectionForCommandLines() const override;
 };
 
-class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
+class LLVM_ABI TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
   mutable unsigned NextUniqueID = 0;
   const TargetMachine *TM = nullptr;
 
@@ -225,7 +226,7 @@ public:
                                    Align &Alignment) const override;
 };
 
-class TargetLoweringObjectFileWasm : public TargetLoweringObjectFile {
+class LLVM_ABI TargetLoweringObjectFileWasm : public TargetLoweringObjectFile {
   mutable unsigned NextUniqueID = 0;
   SmallPtrSet<GlobalObject *, 2> Used;
 
@@ -251,7 +252,7 @@ public:
                                   const MCSymbol *KeySym) const override;
 };
 
-class TargetLoweringObjectFileXCOFF : public TargetLoweringObjectFile {
+class LLVM_ABI TargetLoweringObjectFileXCOFF : public TargetLoweringObjectFile {
 public:
   TargetLoweringObjectFileXCOFF() = default;
   ~TargetLoweringObjectFileXCOFF() override = default;
@@ -315,7 +316,7 @@ public:
                                const TargetMachine &TM) const override;
 };
 
-class TargetLoweringObjectFileGOFF : public TargetLoweringObjectFile {
+class LLVM_ABI TargetLoweringObjectFileGOFF : public TargetLoweringObjectFile {
   std::string DefaultRootSDName;
   std::string DefaultADAPRName;
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/153049