Not aliasing the stdlib should allows it to be used in inlinable code.
Since builtin isn't imported explicitly, references to it shouldn't use
the alias.
rdar://104582241
In AliasModuleNames, avoid wrongfully printing aliased names for modules
that were not aliased. This can happen in the case of modules indirectly
imported via a reexport.
rdar://102262019
Ambiguities are introduced in generated swiftinterfaces when a type
shares a name with a module (i.e. XCTest). This workaround uses the
module-alias feature to avoid these ambiguities. Writing module
references with a distinguishable prefix should allow normal
type-checking to avoid the usual ambiguities.
We should still aim for a proper fully-qualified named syntax, but this
may help in the mean time.
rdar://101969500
