[Dependency Scanning] Initialize Swift modules in libSwiftScan on scanner creation\nResolves rdar://124100615

Author: artemcm

tools/libSwiftScan/libSwiftScan.cpp

@@ -15,6 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "swift/Basic/LLVMInitialize.h"
+#include "swift/Basic/InitializeSwiftModules.h"
 #include "swift/DependencyScan/DependencyScanImpl.h"
 #include "swift/DependencyScan/DependencyScanningTool.h"
 #include "swift/DependencyScan/StringUtils.h"
@@ -130,6 +131,7 @@ void swiftscan_scanner_cache_reset(swiftscan_scanner_t scanner) {
 
 swiftscan_scanner_t swiftscan_scanner_create(void) {
   INITIALIZE_LLVM();
+  initializeSwiftModules();
   return wrap(new DependencyScanningTool());
 }