[flang][driver] Generate run-time type info

This is a small follow-up for https://reviews.llvm.org/D120051. It makes
sure that tables with "run-time type information for derived types" are
generated for code-gen actions. Originally, only non-code-gen actions
were updated (i.e. actions that were fully supported at that time).

Differential Revision: https://reviews.llvm.org/D127307

flang/lib/Frontend/FrontendActions.cpp

@@ -90,7 +90,8 @@ bool CodeGenAction::beginSourceFileAction() {
   // Otherwise, generate an MLIR module from the input Fortran source
   assert(getCurrentInput().getKind().getLanguage() == Language::Fortran &&
          "Invalid input type - expecting a Fortran file");
-  bool res = runPrescan() && runParse() && runSemanticChecks();
+  bool res = runPrescan() && runParse() && runSemanticChecks() &&
+             generateRtTypeTables();
   if (!res)
     return res;
 

flang/test/Lower/derived-type-descriptor.f90

@@ -1,5 +1,6 @@
 ! Test lowering of derived type descriptors builtin data
 ! RUN: bbc -emit-fir %s -o - | FileCheck %s
+! RUN: %flang_fc1 -emit-fir %s -o - | FileCheck %s
 
 subroutine foo()
   real, save, target :: init_values(10, 10)