Test data split between compiledJava tests and compiledKotlin tests

Basically, this commit splits test data from the from java-txt-kt to two pairs java-txt and kt-txt.
This commit leads to some duplication in test data.
This is temporary: in the platform types branch the test data for LoadJava tests will be changed dramatically, so duplication will go away

compiler/testData/loadJava/compiledKotlinWithStdlib/mutability/LoadIterableWithNullability.kt

@@ -0,0 +1,13 @@
+package test
+
+import org.jetbrains.annotations.*
+
+public trait LoadIterableWithNullability<T> {
+    Mutable
+    public fun getIterable(): MutableIterable<T>
+    public fun setIterable([Mutable] p0: MutableIterable<T>)
+
+    ReadOnly
+    public fun getReadOnlyIterable(): Iterable<T>
+    public fun setReadOnlyIterable([ReadOnly] p0: Iterable<T>)
+}