[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/functionInAnotherFile.kt

@@ -43,3 +43,4 @@ fun bar(x: Int) =
 // foo.kt:4 foo
 // foo.kt:5 foo
 // test.kt:21 bar
+// test.kt:14 box