swift234

ClangImporter: Remove common prefix of C enum case names from Swift names.

Swift enum cases are already namespaced to their type, but Cocoa NS_ENUM constants are manually namespaced with a common prefix, so if we imported them as-is, we'd end up with expressions like 'NSStringSearchOptions.NSStringSearchCaseSensitive'. To make this a bit nicer, look for a common prefix of camel-case words among all of the constants in the enum, and remove that prefix from the enum case names in the Swift interface.

In the case of a single enum case, we have no basis for determining a prefix, so do nothing. This case doesn't come up in the frameworks (that I can see).

Swift SVN r9993