Added multi-module tests on incremental compilation.

Changing code wasn't required, Java's incremental caches were enough.

jps-plugin/testData/incremental/multiModule/circularDependencyClasses/build.log

@@ -0,0 +1,14 @@
+Cleaning output files:
+out/production/module2/b/B.class
+out/production/module2/b/BB.class
+End of files
+Compiling files:
+module2/src/module2_b.kt
+End of files
+Cleaning output files:
+out/production/module1/a/A.class
+out/production/module1/a/AA.class
+End of files
+Compiling files:
+module1/src/module1_a.kt
+End of files