LRUCache for TypeSystemSwiftTypeRef::GetCanonicalType #9400
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A synthetic perftest gives the following results (
frame variable some_large_var):Before: GetCanonicalType = 5.2s, CommandObjectFrameVariable::DoExecute = 24.1s
After: GetCanonicalType = 0.5s, CommandObjectFrameVariable::DoExecute = 19.1s