Properly compute resource folder when linking statically

- deduplicate the logic to compute the resource folder
- install headers and module files in shared and static resource folders
- forward -static flag when calling swiftc with -print-target-info

lib/Frontend/ArgsToFrontendOptionsConverter.cpp

@@ -193,6 +193,7 @@ bool ArgsToFrontendOptionsConverter::convert(
   Opts.EnableSourceImport |= Args.hasArg(OPT_enable_source_import);
   Opts.ImportUnderlyingModule |= Args.hasArg(OPT_import_underlying_module);
   Opts.EnableIncrementalDependencyVerifier |= Args.hasArg(OPT_verify_incremental_dependencies);
+  Opts.UseSharedResourceFolder = !Args.hasArg(OPT_use_static_resource_dir);
 
   computeImportObjCHeaderOptions();
   computeImplicitImportModuleNames();