Merge pull request dotnet/coreclr#18645 from tgiphil/readonly
authorJan Kotas <jkotas@microsoft.com>
Wed, 27 Jun 2018 18:55:04 +0000 (11:55 -0700)
committerGitHub <noreply@github.com>
Wed, 27 Jun 2018 18:55:04 +0000 (11:55 -0700)
Changed internal value to readonly for primitive types

Commit migrated from https://github.com/dotnet/coreclr/commit/eeb9e89062de718a5cce60b520aa919299840142


Trivial merge