Speed up type resolution some more.  On the testcase in PR224, for example, this speeds up a release llvm-as from 21.95s to 11.21s, because before it would do an expensive traversal of the type-graph of every type resolved.
Speed up type resolution some more.  On the testcase in PR224, for example,
this speeds up a release llvm-as from 21.95s to 11.21s, because before it
would do an expensive traversal of the type-graph of every type resolved.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@11242 91177308-0d34-0410-b5e6-96231b3b80d8

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