Fix incorrectly chosen Atomic Branch predicate when several modes are enabled

In case both umin and umax Atomic Branch modes are enabled, predication
should be done based on an actual atomic processed, not on a mode enabled.

Author: eternastudento

IGC/Compiler/CustomSafeOptPass.cpp

@@ -7423,7 +7423,7 @@ void InsertBranchOpt::atomicSplitOpt(Function& F, int mode)
             // if (src > (for UMax) or < (for Umin) x)
             //    use the original atomic umax/umin inst src
             readI = createReadFromAtomic( builder, inst, isTyped );
-            CmpInst::Predicate predicate = umaxMode ? ICmpInst::ICMP_UGT : ICmpInst::ICMP_ULT;
+            CmpInst::Predicate predicate = ( op == AtomicOp::EATOMIC_UMAX ) ? ICmpInst::ICMP_UGT : ICmpInst::ICMP_ULT;
             Instruction* condInst = dyn_cast<Instruction>( builder.CreateICmp( predicate, src, readI ) );
 
             splitBBAndName( condInst, inst, &ThenTerm, nullptr, MergeBlock );