[flang] Remove IEEE_DENORM from IEEE_ALL (#67573)

The array of all exceptions IEEE_ALL defined in the intrinsic module
IEEE_EXCEPTIONS should contain only what the standard mandates. Existing
code depends on it having only five elements. The legacy extension
exception flag IEEE_DENORM shouldn't be an element.

Author: klausler

flang/module/__fortran_ieee_exceptions.f90

@@ -27,10 +27,8 @@
     ieee_denorm = ieee_flag_type(32) ! PGI extension
 
   type(ieee_flag_type), parameter :: &
-    ieee_usual(*) = [ &
-      ieee_overflow, ieee_divide_by_zero, ieee_invalid ], &
-    ieee_all(*) = [ &
-      ieee_usual, ieee_underflow, ieee_inexact, ieee_denorm ]
+    ieee_usual(*) = [ ieee_overflow, ieee_divide_by_zero, ieee_invalid ], &
+    ieee_all(*) = [ ieee_usual, ieee_underflow, ieee_inexact ]
 
   type :: ieee_modes_type ! Fortran 2018, 17.7
     private