[LICM][NFC] Do not forward declaration of hoistMinMax

They all are now handled by hoistArithmetics, and only it should be
forwarded.

Author: xortator

llvm/lib/Transforms/Scalar/LICM.cpp

@@ -175,11 +175,6 @@ static bool hoistArithmetics(Instruction &I, Loop &L,
                              ICFLoopSafetyInfo &SafetyInfo,
                              MemorySSAUpdater &MSSAU, AssumptionCache *AC,
                              DominatorTree *DT);
-/// Try to simplify things like (A < INV_1 AND icmp A < INV_2) into (A <
-/// min(INV_1, INV_2)), if INV_1 and INV_2 are both loop invariants and their
-/// minimun can be computed outside of loop, and X is not a loop-invariant.
-static bool hoistMinMax(Instruction &I, Loop &L, ICFLoopSafetyInfo &SafetyInfo,
-                        MemorySSAUpdater &MSSAU);
 static Instruction *cloneInstructionInExitBlock(
     Instruction &I, BasicBlock &ExitBlock, PHINode &PN, const LoopInfo *LI,
     const LoopSafetyInfo *SafetyInfo, MemorySSAUpdater &MSSAU);
@@ -2418,6 +2413,9 @@ bool pointerInvalidatedByBlock(BasicBlock &BB, MemorySSA &MSSA, MemoryUse &MU) {
   return false;
 }
 
+/// Try to simplify things like (A < INV_1 AND icmp A < INV_2) into (A <
+/// min(INV_1, INV_2)), if INV_1 and INV_2 are both loop invariants and their
+/// minimun can be computed outside of loop, and X is not a loop-invariant.
 static bool hoistMinMax(Instruction &I, Loop &L, ICFLoopSafetyInfo &SafetyInfo,
                         MemorySSAUpdater &MSSAU) {
   bool Inverse = false;