[clang-offload-bundler] Restore --check-section functionality

Some changes related to --check-section option were lost during
conflict resolution. This patch restores this code.

Signed-off-by: Sergey Dmitriev <[email protected]>

Author: sndmitriev

clang/tools/clang-offload-bundler/ClangOffloadBundler.cpp

@@ -1551,7 +1551,7 @@ int main(int argc, const char **argv) {
     return 0;
   }
 
-  if (OutputFileNames.getNumOccurrences() == 0) {
+  if (OutputFileNames.getNumOccurrences() == 0 && !CheckSection) {
     reportError(createStringError(
         errc::invalid_argument,
         "for the --outputs option: must be specified at least once!"));
@@ -1662,6 +1662,15 @@ int main(int argc, const char **argv) {
     ++Index;
   }
 
+  if (CheckSection) {
+    Expected<bool> Res = CheckBundledSection();
+    if (!Res) {
+      reportError(Res.takeError());
+      return 1;
+    }
+    return !*Res;
+  }
+
   // Host triple is not really needed for unbundling operation, so do not
   // treat missing host triple as error if we do unbundling.
   if ((Unbundle && HostTargetNum > 1) || (!Unbundle && HostTargetNum != 1)) {