[Autobackout][FuncReg]Revert of change: 63cefea

 Changing default value for -unroll-partial-threshold LLVM option

Reducing default value for unroll-partial-threshold

Author: agrabezh

IGC/AdaptorOCL/dllInterfaceCompute.cpp

@@ -1177,20 +1177,6 @@ bool TranslateBuildSPMD(
                 llvm::cl::ParseCommandLineOptions(sizeof(args) / sizeof(args[0]), args);
             }
         }
-        // Reduce default unroll-partial-threshold value to 100.
-        // The aggressive partial unroll lead to performance issues due to increase
-        // of register pressure and code divergency. The reduced partial unroll
-        // threshold value fixes these performance defects.
-        llvm::StringRef partialUnrollFlag = "-unroll-partial-threshold=100";
-        auto partialUnrollSwitch = optionsMap.find(partialUnrollFlag.trim("-=100"));
-        if (partialUnrollSwitch != optionsMap.end())
-        {
-            if (partialUnrollSwitch->getValue()->getNumOccurrences() == 0)
-            {
-                const char* const args[] = { "igc", partialUnrollFlag.data() };
-                llvm::cl::ParseCommandLineOptions(sizeof(args) / sizeof(args[0]), args);
-            }
-        }
     }
 
     if (IGC_IS_FLAG_ENABLED(QualityMetricsEnable))