type category list now supports a regular expression argument that filters...

type category list now supports a regular expression argument that filters categories to only include the ones matching the regex
type summary list now supports a -w flag with a regular expression argument that filters categories to only include the ones matching the regex
in category and summary listings, categories are printed in a meaningful order:
 - enabled ones first, in the order in which they are searched for summaries
 - disabled ones, in an unspecified order
type summary list by default only expands non-empty enabled categories. to obtain a full listing, you must use the -w flag giving a "match-all" regex

llvm-svn: 135529