[JS IR] Improve debug info for functions with default parameters

Don't generate unnecessary mappings so that the user doesn't need to
step in many times to get where they want

#KT-46276

js/js.translator/testData/lineNumbers/complexExpressionAsDefaultArgument.kt

@@ -11,5 +11,5 @@ fun baz() = 1
 
 fun bar() = 2
 
-// LINES(JS):    1       3 3 2 2 4 3 4 4 4 5 5     2 8 8 10 10 10    12 12 12
-// LINES(JS_IR): 1 * 1 1 3 3             4 5   1 *   8 8 10 10 10 10 12 12 12 12
+// LINES(JS):    1   3 3 2 2 4 3 4 4 4 5 5 2 8 8 10 10 10    12 12 12
+// LINES(JS_IR): 1 * 3 3             4 5   * 8 8 10 10 10 10 12 12 12 12

js/js.translator/testData/lineNumbers/dataClass.kt

@@ -4,6 +4,4 @@ data class A(
 )
 
 // LINES(JS):    1 2 3 * 1 2 2 1 3 3 1 1 1 2 3 1 1 1 2 3 1 1 1 2 3 1 1 1 1 1 2 3
-
-// FIXME: componentN function body should point to the corresponding property.
-// LINES(JS_IR): 1 1 2 2 3 3 2 2 2 3 3 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
+// LINES(JS_IR): 1 1 2 2 3 3 2 2 2 3 3 3 1 1 1 1 1 1 1 1 1 1 1 1 * 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

js/js.translator/testData/lineNumbers/memberFunWithDefaultParam.kt

@@ -11,4 +11,4 @@ class B : A() {
 }
 
 // LINES(JS):    1   2 2 2 2 2 2 2 2 2 4 4 4 * 7 7 8 10 9 9
-// LINES(JS_IR): 1 1 2 2 2 2 2 2 2     4 4 4 7 7 7 8    9 9
+// LINES(JS_IR): 1 1 2 2 2 2 2 *       4 4 4 7 7 7 8    9 9

js/js.translator/testData/lineNumbers/optionalArgs.kt

@@ -7,5 +7,5 @@ fun box(
     println(y)
 }
 
-// LINES(JS):    1 8 2 2 2 2     3 3 3 4   6 6 7 7
-// LINES(JS_IR): 1 1 2       1 1       4 1 6 6 7 7
+// LINES(JS):    1 8 2 2 2 2     3 3 3 4 6 6 7 7
+// LINES(JS_IR): 1   2                 4 6 6 7 7