[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/jsCode.kt

@@ -57,6 +57,7 @@ fun box() {
 
 // EXPECTATIONS
 // test.kt:39 box
+// test.kt:36 noop
 // test.kt:41 box
 // test.kt:42 box
 // a.kt:11 box
@@ -78,3 +79,4 @@ fun box() {
 // a.kt:6 exclamate
 // a.kt:29 box
 // a.kt:22 value
+// test.kt:56 box