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/compiledJava/vararg/VarargInt.txt

@@ -0,0 +1,6 @@
+package test
+
+public open class VarargInt {
+    public constructor VarargInt()
+    public open fun vararg(/*0*/ vararg p0: kotlin.Int /*kotlin.IntArray*/): kotlin.Unit
+}