Add EvictingFileByteStore and make FileByteStore non-evicting.

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index 4e4e88f5439484b19fdb866e13eebd944810c7f1..1ea9e8d24cceb13a7a178d2b8d1aab557f9cf068 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -382,7 +382,7 @@ class AnalysisServer {
     }
     if (resourceProvider is PhysicalResourceProvider) {
       byteStore = new MemoryCachingByteStore(
-          new FileByteStore(
+          new EvictingFileByteStore(
               resourceProvider.getStateLocation('.analysis-driver').path,
               1024 * 1024 * 1024 /*1 GiB*/),
           64 * 1024 * 1024 /*64 MiB*/);