[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/anonymousFunction.kt

@@ -19,4 +19,5 @@ fun box() {
 // EXPECTATIONS JS_IR
 // test.kt:6 box
 // test.kt:3 eval
-// test.kt:7 box$lambda
+// test.kt:7 box$lambda
+// test.kt:9 box