[FIR2IR] Add Unit coercion for non-last expressions in try/catch blocks

^KT-61088 Fixed

compiler/testData/codegen/box/polymorphicSignature/insideTry.kt

@@ -6,13 +6,18 @@ import java.lang.invoke.MethodHandles
 import java.lang.invoke.MethodType
 
 object O {
-    fun main() {}
+    var counter = 0
+    fun main() {
+        counter += 1
+    }
 }
 
 fun box(): String {
     try {
         val mh = MethodHandles.lookup().findVirtual(O::class.java, "main", MethodType.methodType(Void.TYPE))
         mh.invokeExact(O)
+        mh.invokeExact(O)
     } finally {}
+    if (O.counter != 2) return "Fail: counter == ${O.counter}"
     return "OK"
 }

compiler/testData/codegen/box/polymorphicSignature/varargOfObjects_after.kt

@@ -1,6 +1,4 @@
 // !LANGUAGE: +PolymorphicSignature
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR
-// FIR status: Fail 9
 // TARGET_BACKEND: JVM
 // FULL_JDK
 // SKIP_JDK6