Elements. Build _InfoXyz classes and write() them.

...instead of writing data directly into byte sink. This way coupled
implementations of writing and reading are close together.

Change-Id: I78bbba42716af005fb0c96e30602b01b6abcd4f7
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/439822
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: scheglov

pkg/analyzer/lib/src/dart/analysis/driver.dart

@@ -109,7 +109,7 @@ testFineAfterLibraryAnalyzerHook;
 // TODO(scheglov): Clean up the list of implicitly analyzed files.
 class AnalysisDriver {
   /// The version of data format, should be incremented on every format change.
-  static const int DATA_VERSION = 494;
+  static const int DATA_VERSION = 498;
 
   /// The number of exception contexts allowed to write. Once this field is
   /// zero, we stop writing any new exception contexts in this process.