[analyzer] Deduplicate strings in Declaration
This CL removes some duplication of Strings:
* Most duplication in `relevanceTagsInFile` (`ElementKind.CLASS`, etc)
when loaded from file.
* Usage of `()` for `parameters`.
* Empty string return type.
* Known type return type.
On the analyzer instance I've measured on (8 folders with analyzer etc
open) this saves:
Before CL: 161851 kb 2158725 _OneByteString dart:core
1: 154622 kb 2001695 _OneByteString dart:core // removes most practical duplication from relevanceTagsInFile
2: 153247 kb 1957751 _OneByteString dart:core // Removes () parameters
3: 152970 kb 1939890 _OneByteString dart:core // Removes empty string return type
3: 151287 kb 1886063 _OneByteString dart:core // removes void, String, bool, int, Future<void> return type
That's a total of 10,564 kb or 272,662 instances.
This is also ~1.7% of total ram usage.
Change-Id: Ide2ae55ae052d9f8bc382805a204dce48bf2b263
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/273742
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
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