[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/ifThenElseFalse.kt

@@ -39,9 +39,12 @@ fun box() {
 // test.kt:15 box
 // test.kt:8 foo
 // test.kt:5 cond
+// test.kt:12 foo
 // test.kt:16 box
 // test.kt:17 box
 // test.kt:8 foo
 // test.kt:5 cond
 // test.kt:9 foo
 // test.kt:5 cond
+// test.kt:12 foo
+// test.kt:18 box