[Driver] Address review comments, improved var names and arg checks

Signed-off-by: Michael D Toguchi <michael.d.toguchi@intel.com>

Author: mdtoguchi

clang/lib/Driver/ToolChains/SYCL.cpp

@@ -271,19 +271,20 @@ void SYCL::fpga::BackendCompiler::ConstructJob(Compilation &C,
   } else {
     // Output directory is based off of the first object name
     for (Arg * Cur : Args) {
-      SmallString<128> AN = Cur->getSpelling();
-      StringRef Ext(llvm::sys::path::extension(AN));
-      if (!Ext.empty()) {
-        types::ID Ty = getToolChain().LookupTypeForExtension(Ext.drop_front());
-        if (Ty == types::TY_INVALID)
-          continue;
-        if (types::isSrcFile(Ty) || Ty == types::TY_Object) {
-          // Output is based on the filename only so strip off any directory
-          // information if provided with the source/object file.
-          AN = llvm::sys::path::filename(AN);
-          if (!AN.empty()) {
-            llvm::sys::path::replace_extension(AN, "prj");
-            ReportOptArg += Args.MakeArgString(AN);
+      if (Cur->getOption().getKind() == Option::InputClass) {
+        SmallString<128> ArgName = Cur->getSpelling();
+        StringRef Ext(llvm::sys::path::extension(ArgName));
+        if (!Ext.empty()) {
+          types::ID Ty =
+              getToolChain().LookupTypeForExtension(Ext.drop_front());
+          if (Ty == types::TY_INVALID)
+            continue;
+          if (types::isSrcFile(Ty) || Ty == types::TY_Object) {
+            // Project report should be saved into CWD, so strip off any
+            // directory information if provided with the input file.
+            ArgName = llvm::sys::path::filename(ArgName);
+            llvm::sys::path::replace_extension(ArgName, "prj");
+            ReportOptArg += Args.MakeArgString(ArgName);
             break;
           }
         }