llvm-config: Set LinkMode in addition to LinkDyLib when using --ignore-llvm

[dschuff]

Summary

LinkDyLib is only used (before arg processing) to set up the default for
LinkMode. So reset LinkMode as well, and process before --link-shared or
--link-static to allow those flags to continue to override it.

[beanz]

LGTM! Thanks!

tools/llvm-config/llvm-config.cpp

#endif
       } else if (Arg == "--has-global-isel") {
         OS << LLVM_HAS_GLOBAL_ISEL << '\n';
       } else if (Arg == "--shared-mode") {
         PrintSharedMode = true;
       } else if (Arg == "--obj-root") {
         OS << ActivePrefix << '\n';
       } else if (Arg == "--src-root") {
         OS << LLVM_SRC_ROOT << '\n';
+      } else if (Arg == "--ignore-libllvm") {
+        LinkDyLib = false;
+        LinkMode = BuiltSharedLibs ? LinkModeShared : LinkModeAuto;
       } else if (Arg == "--link-shared") {
         LinkMode = LinkModeShared;
       } else if (Arg == "--link-static") {
         LinkMode = LinkModeStatic;
-      } else if (Arg == "--ignore-libllvm") {
-        LinkDyLib = false;
       } else {
         usage();
       }
     } else {
       Components.push_back(Arg);
     }
   }