KW fixes

Change-Id: Icf130adf8464b455692ba871a0da8f2e33897840

Author: unboagable

IGC/Compiler/ThreadCombining.cpp

@@ -612,7 +612,7 @@ bool ThreadCombining::runOnModule(llvm::Module& M)
     // This value tells us what is the minimum acceptable threadgroup size
     // to make sure that we are not too aggressive with thread combining.
     // Current Heurstic is to have no less than 8 H/W threads per WG.
-    unsigned int minTGSizeHeuristic;
+    unsigned int minTGSizeHeuristic = 0;
 
     SIMDMode simdMode = csCtx->GetLeastSIMDModeAllowed();
     // If SIMD8 is legal then, heuristics are SIMD8 selection if spill is