[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/recursion.kt

@@ -36,3 +36,4 @@ fun foo(n :Int ) : Int {
 // test.kt:9 foo
 // test.kt:11 foo
 // test.kt:11 foo
+// test.kt:5 box