Kapt: Add DUMP_DEFAULT_PARAMETER_VALUES flag (KT-29355)

Put initializers on fields when corresponding primary constructor
  parameters have a default value specified. The new behavior
  is available under the new 'DUMP_DEFAULT_PARAMETER_VALUES' flag.

Note that this doesn't affect regular functions with default parameter
  values, as well as primary constructor parameters without a
  'val' or 'var' keyword.

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

@@ -0,0 +1,42 @@
+package error;
+
+public final class NonExistentClass {
+}
+
+////////////////////
+
+package test;
+
+import java.lang.System;
+
+@kotlin.Metadata()
+@java.lang.annotation.Retention(value = java.lang.annotation.RetentionPolicy.RUNTIME)
+public abstract @interface Anno {
+}
+
+////////////////////
+
+package test;
+
+import java.lang.System;
+
+@kotlin.Metadata()
+@Anno()
+public final class User {
+    @org.jetbrains.annotations.NotNull()
+    private final java.lang.String name = "John";
+
+    @org.jetbrains.annotations.NotNull()
+    public final java.lang.String getName() {
+        return null;
+    }
+
+    public User(@org.jetbrains.annotations.NotNull()
+    java.lang.String name, int age) {
+        super();
+    }
+
+    public User() {
+        super();
+    }
+}

plugins/kapt3/kapt3-compiler/testData/kotlinRunner/DefaultParameterValues.kt

@@ -0,0 +1,8 @@
+// DUMP_DEFAULT_PARAMETER_VALUES
+
+package test
+
+@Anno
+class User(val name: String = "John", age: Int = 18)
+
+internal annotation class Anno

plugins/kapt3/kapt3-compiler/testData/kotlinRunner/DefaultParameterValues.txt

@@ -0,0 +1 @@
+