Move deserialization of import search paths into the scratch context #5692
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Import and framework search paths were previously not discovered by
validateSerializedAST() so SwiftASTContextForExpressions had the
various per-module SwiftASTContext load all registered Swift modules
and then grabbed the discovered search paths from their respective
deserialized CompilerInvocations. We now extended
validateSerializedAST() to also deserialize the search paths, which
allows getting rid of this last dependency between
SwiftASTContextForExpressions and the per-module SwiftASTContexts.
rdar://40097459