[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/anonymousFunctionDirect.kt

@@ -18,3 +18,4 @@ fun box() {
 // EXPECTATIONS JS_IR
 // test.kt:4 box
 // test.kt:5 box$lambda
+// test.kt:7 box