[llvm] [RISCV] Prefer vsetivli for VLMAX when VLEN is exactly known (PR #75509)

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``````````bash
git-clang-format --diff 7537c3c452df36447719291bebc5589bdd5d1501 6b97bc1be41b1db3427fd6a1fa2d52cf25979a9a -- llvm/lib/Target/RISCV/RISCVISelLowering.cpp llvm/lib/Target/RISCV/RISCVInsertVSETVLI.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVInsertVSETVLI.cpp b/llvm/lib/Target/RISCV/RISCVInsertVSETVLI.cpp
index 1aa35f1c64..32419fc148 100644
--- a/llvm/lib/Target/RISCV/RISCVInsertVSETVLI.cpp
+++ b/llvm/lib/Target/RISCV/RISCVInsertVSETVLI.cpp
@@ -807,7 +807,7 @@ static unsigned computeVLMAX(unsigned VLEN, unsigned SEW,
     VLEN = VLEN / LMul;
   else
     VLEN = VLEN * LMul;
-  return VLEN/SEW;
+  return VLEN / SEW;
 }
 
 static VSETVLIInfo computeInfoForInstr(const MachineInstr &MI, uint64_t TSFlags,
@@ -861,8 +861,7 @@ static VSETVLIInfo computeInfoForInstr(const MachineInstr &MI, uint64_t TSFlags,
           InstrInfo.setAVLImm(VLMAX);
         else
           InstrInfo.setAVLReg(RISCV::X0);
-      }
-      else
+      } else
         InstrInfo.setAVLImm(Imm);
     } else {
       InstrInfo.setAVLReg(VLOp.getReg());

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https://github.com/llvm/llvm-project/pull/75509