Add proper ILP Flags for xlf.

Author: friedc

CMAKE/CheckLAPACKCompilerFlags.cmake

@@ -22,6 +22,9 @@ if ( FORTRAN_ILP )
         else ()
             set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -integer-size 64")
         endif()
+    elseif( (CMAKE_Fortran_COMPILER_ID STREQUAL "VisualAge" ) OR  # CMake 2.6
+            (CMAKE_Fortran_COMPILER_ID STREQUAL "XL" ) )          # CMake 2.8
+        set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -qintsize=8")
     else()
         set(CPE_ENV $ENV{PE_ENV})
         if(CPE_ENV STREQUAL "CRAY")