[FE 1.0] Always create return value for CallInstruction

This fixes missing `USED_AS_EXPRESSION` recordings
^KT-47527 Fixed

compiler/testData/ir/irText/declarations/kt47527.kt.txt

@@ -0,0 +1,48 @@
+fun test_1(value: Any?): String? {
+  return { // BLOCK
+    val tmp0_safe_receiver: Any? = value
+    when {
+      EQEQ(arg0 = tmp0_safe_receiver, arg1 = null) -> null
+      else -> tmp0_safe_receiver.let<Any, Nothing>(block = local fun <anonymous>(it: Any): Nothing {
+        return "O"
+      }
+)
+    }
+  }
+}
+
+fun test_2(value: Any?): String? {
+  return run<Nothing?>(block = local fun <anonymous>(): Nothing? {
+    return { // BLOCK
+      val tmp0_safe_receiver: Any? = value
+      when {
+        EQEQ(arg0 = tmp0_safe_receiver, arg1 = null) -> null
+        else -> tmp0_safe_receiver.let<Any, Nothing>(block = local fun <anonymous>(it: Any): Nothing {
+          return "K"
+        }
+)
+      }
+    }
+  }
+)
+}
+
+fun box(): String {
+  var result: String = ""
+  result = result.plus(other = { // BLOCK
+    val tmp0_elvis_lhs: String? = test_1(value = 1)
+    when {
+      EQEQ(arg0 = tmp0_elvis_lhs, arg1 = null) -> return "fail 1"
+      else -> tmp0_elvis_lhs
+    }
+  })
+  result = result.plus(other = { // BLOCK
+    val tmp1_elvis_lhs: String? = test_2(value = 1)
+    when {
+      EQEQ(arg0 = tmp1_elvis_lhs, arg1 = null) -> return "fail 2"
+      else -> tmp1_elvis_lhs
+    }
+  })
+  return result
+}
+