[flang][NFC] Add tests for fir.address_of

[clementval]

Summary

This patch adds FIR to LLVM test for fir.address_of.

This patch is part of the upstreaming effort from fir-dev branch.

[schweitz]

flang/test/Fir/arrayset.fir

2

What is the point of running a nullary fir-opt pass?

[clementval]

Remove extra fir-opt

flang/test/Fir/addrof.fir

+// RUN: fir-opt %s | tco | FileCheck %s
+
+// CHECK: @var_x = external global i32
+fir.global @var_x : !fir.int<4> {}
+
+// CHECK-LABEL: define i32* @getAddressOfX
+func @getAddressOfX() -> !fir.ref<!fir.int<4>> {
+  %1 = fir.address_of(@var_x) : !fir.ref<!fir.int<4>>
+  // CHECK: ret i32* @var_x
+  return %1 : !fir.ref<!fir.int<4>>
+}

flang/test/Fir/arrayset.fir

+// RUN: tco %s | FileCheck %s
+
+// CHECK-LABEL: define void @x([10 x float]* %0)
+func @x(%arr : !fir.ref<!fir.array<10xf32>>) {
+  %1 = arith.constant 0 : index
+  %2 = arith.constant 9 : index
+  %stepvar = arith.constant 1 : index
+  // CHECK: alloca [10 x float], i64 1
+  %a = fir.alloca !fir.array<10xf32>
+  fir.do_loop %iv = %1 to %2 step %stepvar unordered {
+    %3 = fir.coordinate_of %arr, %iv : (!fir.ref<!fir.array<10xf32>>, index) -> !fir.ref<f32>
+  // CHECK: %[[reg10:.*]] = load float, float*
+    %4 = fir.load %3 : !fir.ref<f32>
+  // CHECK: %[[reg11:.*]] = getelementptr [10 x float], [10 x float]*
+    %5 = fir.coordinate_of %a, %iv : (!fir.ref<!fir.array<10xf32>>, index) -> !fir.ref<f32>
+  // CHECK: store float %[[reg10]], float* %[[reg11]]
+    fir.store %4 to %5 : !fir.ref<f32>
+  }
+  %6 = fir.embox %a : (!fir.ref<!fir.array<10xf32>>) -> !fir.box<!fir.array<10xf32>>
+  fir.call @y(%6) : (!fir.box<!fir.array<10xf32>>) -> ()
+  return
+}
+
+func private @y(!fir.box<!fir.array<10xf32>>) -> ()