Add mapper field to mapInfoOp.

Author: TIFitis

Diff for: flang/test/Lower/OpenMP/map-mapper.f90

@@ -0,0 +1,15 @@
+! RUN: %flang_fc1 -emit-hlfir -fopenmp -fopenmp-version=50 %s -o - | FileCheck %s
+program p
+   integer, parameter :: n = 256
+   real(8) :: a(256)
+   type t1
+      integer :: x
+   end type t1
+   !$omp declare mapper(xx : t1 :: nn) map(nn, nn%x)
+   !$omp target map(mapper(xx), from:a)
+!CHECK: not yet implemented: Support for mapper modifiers is not implemented yet
+   do i = 1, n
+      a(i) = 4.2
+   end do
+   !$omp end target
+end program p