Parcelize: Support @IgnoreOnParcel primary constructor parameters...

...with default values.

See https://issuetracker.google.com/177850560

plugins/parcelize/parcelize-compiler/testData/diagnostics/ignoredOnParcelDefaultValues.kt

@@ -0,0 +1,9 @@
+// FIR_IDENTICAL
+package test
+
+import android.os.Parcelable
+import kotlinx.parcelize.Parcelize
+import kotlinx.parcelize.IgnoredOnParcel
+
+@Parcelize
+class A(@IgnoredOnParcel val x: String = "OK") : Parcelable

plugins/parcelize/parcelize-compiler/testData/diagnostics/ignoredOnParcelUnsupportedType.kt

@@ -0,0 +1,16 @@
+// FIR_IDENTICAL
+package test
+
+import android.os.Parcelable
+import kotlinx.parcelize.Parcelize
+import kotlinx.parcelize.IgnoredOnParcel
+
+class T(val x: Int)
+
+@Parcelize
+class A(
+    // T is not parcelable, but we don't need it to be since it is not being serialized.
+    @IgnoredOnParcel val x: T = T(0)
+) : Parcelable {
+    @IgnoredOnParcel val y: T = x
+}