[flang] Fix bug resolving type in type definition

[tskeith]

Summary

When we encountered a type name in a derived type definition, we were
sometimes finding a component of that name rather than the type from
the enclosing scope. Fix this by introducing NonDerivedTypeScope() to
start the search in the right scope.

[tskeith]

Fix typo

[PeteSteinfeld]

I only see a test in this revision. Are there also supposed to be code changes?

flang/test/Semantics/resolve92.f90

 ! RUN: %S/test_errors.sh %s %t %f18
 
 module m
   implicit none
   type t
     integer :: n
   end type
   type t2
-    ! t and t2 must be resoved to types in m, not components in t2
+    ! t and t2 must be resolved to types in m, not components in t2
     type(t) :: t(10) = t(1)
     type(t) :: x = t(1)
     integer :: t2
     type(t2), pointer :: p
   end type
 end