[SYCL] Attach SourceLocation to kernel body to enable coverage gen

       to process the kernel (in NativeCPU). This also requires
       setting the debug location temporarily to the kernel arg
       location so that the expected file is picked up by the
       SourceLocToDebugLoc function used by SYCLOptReportHandler.

Author: uwedolinsky

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -1786,6 +1786,9 @@ void CodeGenFunction::GenerateCode(GlobalDecl GD, llvm::Function *Fn,
     if (SyclOptReport.HasOptReportInfo(FD)) {
       llvm::OptimizationRemarkEmitter ORE(Fn);
       for (auto ORI : llvm::enumerate(SyclOptReport.GetInfo(FD))) {
+        // Temporarily apply arg location to ensure SourceLocToDebugLoc
+        // picks up the expected file.
+        ApplyDebugLocation tmp_raii(*this, ORI.value().KernelArgLoc);
         llvm::DiagnosticLocation DL =
             SourceLocToDebugLoc(ORI.value().KernelArgLoc);
         StringRef NameInDesc = ORI.value().KernelArgDescName;

clang/lib/Sema/SemaSYCL.cpp

@@ -3600,10 +3600,10 @@ class SyclKernelBodyCreator : public SyclKernelFieldHandler {
 
     BodyStmts.insert(BodyStmts.end(), FinalizeStmts.begin(),
                      FinalizeStmts.end());
-    SourceLocation LL =
-        CallOperator ? CallOperator->getBeginLoc() : SourceLocation();
-    SourceLocation LR =
-        CallOperator ? CallOperator->getEndLoc() : SourceLocation();
+
+    const auto *LDcl = NewBody;
+    SourceLocation LL = LDcl ? LDcl->getBeginLoc() : SourceLocation();
+    SourceLocation LR = LDcl ? LDcl->getEndLoc() : SourceLocation();
 
     return CompoundStmt::Create(SemaSYCLRef.getASTContext(), BodyStmts,
                                 FPOptionsOverride(), LL, LR);