Kapt: Add Kotlin location to diagnostics reported in Kapt stubs

plugins/kapt3/kapt3-compiler/testData/kotlinRunner/Simple.it.txt

@@ -5,13 +5,33 @@ public final class NonExistentClass {
 
 ////////////////////
 
+package kapt.internal;
+
+public @interface KaptMetadata {
+
+    public java.lang.String value();
+}
+
+////////////////////
+
+package kapt.internal;
+
+public @interface KaptSignature {
+
+    public java.lang.String value();
+}
+
+////////////////////
+
 package test;
 
 @kotlin.Metadata()
+@kapt.internal.KaptMetadata()
 public enum EnumClass {
     /*public static final*/ BLACK /* = new BLACK() */,
     /*public static final*/ WHITE /* = new WHITE() */;
 
+    @kapt.internal.KaptSignature("<init>(Ljava/lang/String;I)V")
     EnumClass() {
     }
 }
@@ -22,6 +42,7 @@ package test;
 
 @kotlin.Metadata()
 @java.lang.annotation.Retention(value = java.lang.annotation.RetentionPolicy.RUNTIME)
+@kapt.internal.KaptMetadata()
 public abstract @interface MyAnnotation {
 }
 
@@ -30,11 +51,13 @@ public abstract @interface MyAnnotation {
 package test;
 
 @kotlin.Metadata()
+@kapt.internal.KaptMetadata()
 public enum EnumClass2 {
     /*public static final*/ WHITE /* = new WHITE(null) */,
     /*public static final*/ RED /* = new RED(null) */;
     private final java.lang.String blah = null;
 
+    @kapt.internal.KaptSignature("<init>(Ljava/lang/String;ILjava/lang/String;)V")
     EnumClass2(@org.jetbrains.annotations.NotNull()
     java.lang.String blah) {
     }
@@ -44,17 +67,22 @@ public enum EnumClass2 {
 
 package test;
 
+@kotlin.Suppress(names = {"UNRESOLVED_REFERENCE"})
 @kotlin.Metadata()
+@kapt.internal.KaptMetadata()
 public final class Simple {
 
     @MyAnnotation()
+    @kapt.internal.KaptSignature("myMethod()V")
     public final void myMethod() {
     }
 
+    @kapt.internal.KaptSignature("heavyMethod()I")
     public final int heavyMethod() {
         return 0;
     }
 
+    @kapt.internal.KaptSignature("<init>()V")
     public Simple() {
         super();
     }