[FE 1.0] Correctly set USED_AS_EXPRESSION for unreachable catch clauses

^KT-48806 Fixed

compiler/testData/ir/irText/expressions/kt48806.kt

@@ -0,0 +1,16 @@
+// ISSUE: KT-48806
+
+class A {
+    val test_1: Int = try{
+        throw RuntimeException()
+    } catch(e: Exception) {
+        1
+    }
+
+    val test_2: Int = try{
+        1
+    } catch(e: Exception) {
+        throw RuntimeException()
+    }
+}
+