[rebase] descriptor derived type element size computation change at LLVM IR level

Author: jeanPerier

flang/test/Fir/type-descriptor.fir

@@ -8,7 +8,7 @@ fir.global internal @_QFfooEx2 : !fir.box<!fir.heap<!type_defined_elsewhere>> {
 }
 // CHECK: @_QMsome_moduleE.dt.type_defined_elsewhere = extern_weak global i8
 // CHECK: @_QFfooEx2 = internal global { %_QMsome_moduleTtype_defined_elsewhere*, i64, i32, i8, i8, i8, i8, i8*, [1 x i64] }
-// CHECK-SAME: { %_QMsome_moduleTtype_defined_elsewhere* null, i64 ptrtoint (i32* getelementptr (i32, i32* null, i32 1) to i64),
+// CHECK-SAME: { %_QMsome_moduleTtype_defined_elsewhere* null, i64 ptrtoint (%_QMsome_moduleTtype_defined_elsewhere* getelementptr (%_QMsome_moduleTtype_defined_elsewhere, %_QMsome_moduleTtype_defined_elsewhere* null, i32 1) to i64),
 // CHECK-SAME: i32 20180515, i8 0, i8 34, i8 2, i8 1, i8* @_QMsome_moduleE.dt.type_defined_elsewhere, [1 x i64] undef }
 
 !sometype = type !fir.type<_QFfooTsometype{num:i32,values:!fir.box<!fir.ptr<!fir.array<?x?xf32>>>}>