Propagate HasStackCall info in LTO

We need to mark the caller of invoke_simd target to be HasStackCall if in
the context of callee it has stack calls. It is because we will convert
the invoke_simd callsite to be inlined or a subroutine call.
SSO must be inserted for accessing stack frames.

Author: houjenko

visa/BuildCISAIR.h

@@ -746,6 +746,10 @@ class CISA_IR_Builder : public VISABuilder {
                          std::list<std::list<vISA::G4_INST *>::iterator>>
           &callee2Callers);
 
+  // Propagate info from callee to callee
+  void PropagateInfo(
+      vISA::G4_Kernel *caller, vISA::G4_Kernel *callee);
+
   // Perform LinkTimeOptimization for call related transformations
   void LinkTimeOptimization(
       std::unordered_map<vISA::G4_Kernel *,

visa/BuildCISAIRImpl.cpp

@@ -639,6 +639,16 @@ void CISA_IR_Builder::ProcessSgInvokeList(
   }
 }
 
+void CISA_IR_Builder::PropagateInfo(
+    vISA::G4_Kernel *caller, vISA::G4_Kernel *callee) {
+  // Need to propagate HasStackCall from the caller to callee after LTO
+  bool callerHasStackCall =
+    caller->fg.getHasStackCalls() ||
+    callee->fg.getHasStackCalls();
+  if (callerHasStackCall)
+    caller->fg.setHasStackCalls();
+}
+
 // #define DEBUG_LTO
 #ifdef DEBUG_LTO
 #define DEBUG_PRINT(msg) std::cerr << __LINE__ << " " << msg;
@@ -678,6 +688,8 @@ void CISA_IR_Builder::LinkTimeOptimization(
       bool removeStackArg = (options & (1U << Linker_RemoveStackArg)) && caller->fg.builder->hasInt64Add();
       bool removeStackFrame = (options & (1U << Linker_RemoveStackFrame));
 
+      PropagateInfo(caller, callee);
+
       G4_INST *calleeLabel = *callee->fg.builder->instList.begin();
       vISA_ASSERT(calleeLabel->isLabel() == true, "Entry inst is not a label");