File separator mismatch on Win-64

Four AOT tests has the wrong file separator when run on Windows:

JavaTest Message: JUnit Failure: itShouldReturnSourceWhenAllIsValid(jdk.tools.jaotc.test.collect.jar.JarSourceProviderTest): expected:<[this/bar]> but was:<[this\bar]>
java.lang.AssertionError: expected:<[this/bar]> but was:<[this\bar]>

compiler/aot/jdk.tools.jaotc.test/src/jdk/tools/jaotc/test/collect/ClassSourceTest.java
compiler/aot/jdk.tools.jaotc.test/src/jdk/tools/jaotc/test/collect/SearchPathTest.java
compiler/aot/jdk.tools.jaotc.test/src/jdk/tools/jaotc/test/collect/jar/JarSourceProviderTest.java
compiler/aot/jdk.tools.jaotc.test/src/jdk/tools/jaotc/test/collect/module/ModuleSourceProviderTest.java