[llvm] [RegAlloc] Account for use availability when applying rematerializable weight discount (PR #159180)

[Matt Arsenault via llvm-commits]

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@@ -81,6 +81,14 @@ class VirtRegMap;
     static bool isRematerializable(const LiveInterval &LI,
                                    const LiveIntervals &LIS,
                                    const VirtRegMap &VRM,
+                                   const MachineRegisterInfo &MRI,
+                                   const TargetInstrInfo &TII);
+
+    /// \returns true if all registers used by \p OrigMI at \p OrigIdx are also
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arsenm wrote:

There is no OrigIdx parameter 

https://github.com/llvm/llvm-project/pull/159180