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[analyzer] ObjCGenerics: Don't warn on cast conversions involving exp…
…licit cast The ObjCGenerics checker warns on a cast when there is no subtyping relationship between the tracked type of the value and the destination type of the cast. It does this even if the cast was explicitly written. This means the user can't write an explicit cast to silence the diagnostic. This commit treats explicit casts involving generic types as an indication from the programmer that the Objective-C type system is not rich enough to express the needed invariant. On explicit casts, the checker now removes any existing information inferred about the type arguments. Further, it no longer assumes the casted-to specialized type because the invariant the programmer specifies in the cast may only hold at a particular program point and not later ones. This prevents a suppressing cast from requiring a cascade of casts down the line. rdar://problem/33603303 Differential Revision: https://reviews.llvm.org/D39711 llvm-svn: 318054
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