Use class name as secondary constructor name

compiler/testData/cfg/secondaryConstructors/withoutPrimary.instructions

@@ -41,7 +41,7 @@ error:
 sink:
     <SINK>     PREV:[<ERROR>, <END>]
 =====================
-== <init> ==
+== A ==
 constructor() {
         x = 1
         y = 2
@@ -81,7 +81,7 @@ error:
 sink:
     <SINK>                                  PREV:[<ERROR>, <END>]
 =====================
-== <init> ==
+== A ==
 constructor(a: Int, b: Int = 3) {
         x = a
         y = x
@@ -132,7 +132,7 @@ error:
 sink:
     <SINK>                                         PREV:[<ERROR>, <END>]
 =====================
-== <init> ==
+== A ==
 constructor(a: String, b: Int = 4): this() {
         y = 5
     }
@@ -162,7 +162,7 @@ error:
 sink:
     <SINK>                                         PREV:[<ERROR>, <END>]
 =====================
-== <init> ==
+== A ==
 constructor(a: Double, b: Int = 6): this(a.toInt()) {
         y = 7
     }