202: Fix compilation because of CoreJarVirtualFile

CoreJarVirtualFile is now package private. And seems that
most of VirtualFiles return system independent path

compiler/cli/src/org/jetbrains/kotlin/cli/common/messages/MessageUtil.java.202

+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.cli.common.messages;
+
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.jetbrains.kotlin.diagnostics.DiagnosticUtils;
+import org.jetbrains.kotlin.diagnostics.PsiDiagnosticUtils;
+
+import static com.intellij.openapi.util.io.FileUtil.toSystemDependentName;
+
+public class MessageUtil {
+    private MessageUtil() {}
+
+    @Nullable
+    public static CompilerMessageLocation psiElementToMessageLocation(@Nullable PsiElement element) {
+        if (element == null) return null;
+        PsiFile file = element.getContainingFile();
+        return psiFileToMessageLocation(file, "<no path>", DiagnosticUtils.getLineAndColumnInPsiFile(file, element.getTextRange()));
+    }
+
+    @Nullable
+    public static CompilerMessageLocation psiFileToMessageLocation(
+            @NotNull PsiFile file,
+            @Nullable String defaultValue,
+            @NotNull PsiDiagnosticUtils.LineAndColumn lineAndColumn
+    ) {
+        VirtualFile virtualFile = file.getVirtualFile();
+        String path = virtualFile != null ? virtualFileToPath(virtualFile) : defaultValue;
+        return CompilerMessageLocation.create(path, lineAndColumn.getLine(), lineAndColumn.getColumn(), lineAndColumn.getLineContent());
+    }
+
+    @NotNull
+    public static String virtualFileToPath(@NotNull VirtualFile virtualFile) {
+        return toSystemDependentName(virtualFile.getPath());
+    }
+}