[llvm] [CodeGen][Hexagon] Pass the shared RegisterClassInfo object to Hexagon frame lowering (PR #216752)

[Matt Arsenault via llvm-commits]

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@@ -400,6 +401,14 @@ class LLVM_ABI TargetFrameLowering {
   virtual void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
                                     RegScavenger *RS = nullptr) const;
 
+  /// Called immediately before determineCalleeSaves with the shared
+  /// RegisterClassInfo from the pass manager. Default is a no-op.
+  /// Required since adding to determineCalleeSaves would require modifying
+  /// every target override.
+  virtual void processFunctionBeforeCalleeSaves(
+      MachineFunction &MF, RegScavenger *RS = nullptr,
+      const RegisterClassInfo *RCI = nullptr) const {}
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arsenm wrote:

Make it not optional? You make the analysis required on the single use pass 

https://github.com/llvm/llvm-project/pull/216752