[JS IR] Improve debug info precision for blocks

Namely:
- Generate debug info for closing braces, which allows the breakpoints
  set on closing braces to be hit
- Generate debug info for 'if' and 'try/catch' statements.

KT-46276

compiler/testData/debug/stepping/classObject.kt

@@ -42,7 +42,9 @@ fun box() {
 // test.kt:14 box
 // test.kt:5 <init>
 // test.kt:6 <init>
+// test.kt:4 <init>
 // test.kt:15 box
 // test.kt:16 box
 // test.kt:16 box
-// test.kt:8 foo
+// test.kt:8 foo
+// test.kt:17 box