Disable optimization which sometimes results in incorrect case sensitivity in FrozenCollections#4

andrewjsaid wants to merge 1 commit intofrozen-collections-ordinal-ignore-caseandrewjsaid/dotnet-runtime:frozen-collections-ordinal-ignore-casefrom

frozen-collections-ordinal-ignore-case-remove-optimisationandrewjsaid/dotnet-runtime:frozen-collections-ordinal-ignore-case-remove-optimisationCopy head branch name to clipboard