swift234

fix a bug introduced in r28104: we need to create a PBD to hold the vardecls
we parsed, otherwise the type checker gets confused later.  This fixes these
regressions:

    Swift :: compiler_crashers_fixed/0725-swift-type-walk.swift
    Swift :: compiler_crashers_fixed/0742-swift-metatypetype-get.swift
    Swift :: compiler_crashers_fixed/1501-swift-diagnosticengine-flushactivediagnostic.swift
    Swift :: compiler_crashers_fixed/1705-vtable.swift

Also, that patch fixed 0791-swift-type-walk.swift, so mark it as not crashing.


Swift SVN r28108