[llvm] [BOLT][AArch64] Implement PLTCall optimization (PR #93584)

[Paschalis Mpeis via llvm-commits]

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@@ -1412,9 +1413,15 @@ class MCPlusBuilder {
     return false;
   }
 
-  /// Modify a direct call instruction \p Inst with an indirect call taking
-  /// a destination from a memory location pointed by \p TargetLocation symbol.
-  virtual bool convertCallToIndirectCall(MCInst &Inst,
+  /// Modify a direct call instruction pointed by the iterator \p It, with an
+  /// indirect call taking a destination from a memory location pointed by \p
+  /// TargetLocation symbol. If additional instructions need to be prepended
+  /// before \p It, then the iterator must be updated to point to the indirect
+  /// call instruction.
+  ///
+  /// \return true on success
+  virtual bool convertCallToIndirectCall(BinaryBasicBlock &BB,
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paschalis-mpeis wrote:

On Aarch64, `convertCallToIndirectCall` does more than a direct->indirect call conversion to implement this optimization. If this is considered misleading we could rename the method.

https://github.com/llvm/llvm-project/pull/93584