Emit "unreachable" instruction if a function does not return for non-sycl devices

Author: srividya-sundaram

clang/lib/CodeGen/CGCall.cpp

@@ -4988,10 +4988,10 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
 
   // 4. Finish the call.
 
-  // If the call doesn't return, finish the basic block and clear the
+  // If the call doesn't return for non-sycl devices, finish the basic block and clear the
   // insertion point; this allows the rest of IRGen to discard
   // unreachable code.
-  if (CI->doesNotReturn()) {
+  if (CI->doesNotReturn() && !getLangOpts().SYCLIsDevice) {
     if (UnusedReturnSizePtr)
       PopCleanupBlock();
 
@@ -5017,9 +5017,8 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
         EmitNounwindRuntimeCall(Fn);
       }
     }
-    // Emit unreachable only for non-sycl devices
-    if (!getLangOpts().SYCLIsDevice)
-      EmitUnreachable(Loc);
+    
+    EmitUnreachable(Loc);
     Builder.ClearInsertionPoint();
 
     // FIXME: For now, emit a dummy basic block because expr emitters in