[llvm] [BOLT][AArch64] Expand cmpbr when reversing would overflow (PR #202998)

[Paschalis Mpeis via llvm-commits]

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@@ -2141,8 +2160,11 @@ class MCPlusBuilder {
   }
 
   /// Reverses the branch condition in Inst and update its taken target to TBB.
-  virtual void reverseBranchCondition(MCInst &Inst, const MCSymbol *TBB,
-                                      MCContext *Ctx) const {
+  /// Assumes that the branch is reversible.
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paschalis-mpeis wrote:

Maybe it's worth noting that `reverseBranchCondition` can replace a branch with a longer instruction sequence on some targets?

https://github.com/llvm/llvm-project/pull/202998