StackOverflowDetection: always add private base when ForceAddingStackcallKernelPrerequisites flag is used

StackOverflowDetection mechanism needs stack call prerequisites and setting in implies ForceAddingStackcallKernelPrerequisites flag.

When private base was not used by the kernel the compiler would crash when the flag was enabled, as adding private base was missing under ForceAddingStackcallKernelPrerequisites.

(cherry picked from commit 7c598c8)

Author: PawelJurek

IGC/Compiler/Optimizer/OpenCLPasses/PrivateMemory/PrivateMemoryUsageAnalysis.cpp

@@ -67,7 +67,7 @@ bool PrivateMemoryUsageAnalysis::runOnModule(Module& M)
     // If there are stack called functions in the module, add PRIVATE_BASE to all kernels to be safe.
     // PRIVATE_BASE is needed for kernel to get the stack base offset.
     // Callee does not require this arg, since all stack access will be done using the stack-pointer
-    if (hasStackCall || pCtx->m_enableFunctionPointer)
+    if (hasStackCall || pCtx->m_enableFunctionPointer || IGC_IS_FLAG_ENABLED(ForceAddingStackcallKernelPrerequisites))
     {
         for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
         {