Fix JS source maps for functions with expression body

js/js.translator/testData/lineNumbers/closure.kt

@@ -5,4 +5,4 @@ fun box(x: Int, y: Int): Int {
     return foo(y)
 }
 
-// LINES: 2 4 2 5
+// LINES: 2 2 4 2 5

js/js.translator/testData/lineNumbers/coroutine.kt

@@ -14,4 +14,4 @@ suspend fun bar(): Unit {
     println(a + b)
 }
 
-// LINES: 4 5 6 4 9 9 9 9 9 9 9 9 * 10 11 11 11 11 11 * 11 12 13 13 13 13 13 13 14
+// LINES: 4 5 4 6 4 9 9 9 9 9 9 9 9 * 10 11 11 11 11 11 * 11 12 13 13 13 13 13 13 14

js/js.translator/testData/lineNumbers/expressionAsFunctionBody.kt

@@ -0,0 +1,7 @@
+fun box() =
+        foo()
+
+fun foo() =
+        23
+
+// LINES: 1 2 4 5