[Flang] Handle unused entry dummies before processing shape (#157732)

Check for unused entry dummy arrays with BaseBoxType that calls
genUnusedEntryPointBox() before processing array shapes.

Fixes #132648

Author: ceseo

flang/lib/Lower/ConvertVariable.cpp

@@ -2439,6 +2439,11 @@ void Fortran::lower::mapSymbolAttributes(
 
   // Compute array extents and lower bounds.
   if (ba.isArray()) {
+    // Handle unused entry dummy arrays with BaseBoxType before processing shape
+    if (isUnusedEntryDummy &&
+        llvm::isa<fir::BaseBoxType>(converter.genType(var)))
+      if (genUnusedEntryPointBox())
+        return;
     if (ba.isStaticArray()) {
       if (ba.lboundIsAllOnes()) {
         for (std::int64_t extent :

flang/test/Lower/box-address.f90

@@ -0,0 +1,34 @@
+! RUN: flang -fc1 -emit-hlfir %s -o - | FileCheck %s
+
+module m3
+  type x1
+     integer::ix1
+  end type x1
+  type,extends(x1)::x2
+  end type x2
+  type,extends(x2)::x3
+  end type x3
+  class(x1),pointer,dimension(:)::cy1
+contains
+  subroutine dummy()
+  entry      chk(c1)
+   class(x1),dimension(3)::c1
+ end subroutine dummy
+end module m3
+! CHECK-LABEL: func.func @_QMm3Pchk(
+! CHECK-SAME:    %[[ARG0:.*]]: !fir.class<!fir.array<3x!fir.type<_QMm3Tx1{ix1:i32}>>> {fir.bindc_name = "c1"}) {
+! CHECK:         %[[DUMMY_SCOPE:.*]] = fir.dummy_scope : !fir.dscope
+! CHECK:         %[[DECLARE:.*]]:2 = hlfir.declare %[[ARG0]] dummy_scope %[[DUMMY_SCOPE]] {uniq_name = "_QMm3FdummyEc1"} : (!fir.class<!fir.array<3x!fir.type<_QMm3Tx1{ix1:i32}>>>, !fir.dscope) -> (!fir.class<!fir.array<3x!fir.type<_QMm3Tx1{ix1:i32}>>>, !fir.class<!fir.array<3x!fir.type<_QMm3Tx1{ix1:i32}>>>)
+
+subroutine s1
+  use m3
+  type(x1),target::ty1(3)
+  ty1%ix1=[1,2,3]
+  cy1=>ty1
+  call chk(cy1)
+end subroutine s1
+
+program main
+  call s1
+  print *,'pass'
+end program main