[llvm] [RISCV] Eliminate dead li after emitting VSETVLIs (PR #65934)

[Luke Lau via llvm-commits]

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@@ -263,6 +263,8 @@ namespace RISCV {
 bool isSEXT_W(const MachineInstr &MI);
 bool isZEXT_W(const MachineInstr &MI);
 bool isZEXT_B(const MachineInstr &MI);
+// Returns true if this is the li rd, simm12 pattern, addi rd, x0, simm12.
+bool isLoadSImm12(const MachineInstr &MI, bool NonZero);
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lukel97 wrote:

If this is only used by RISCVInsertVSETVLI.cpp can it just be moved into a static function there?

https://github.com/llvm/llvm-project/pull/65934