Introduce GenericEnvironment refactoring and kill AllArchetypes#4524

Merged

slavapestov merged 13 commits intoswiftlang:masterfrom

slavapestov:generic-environment

Aug 29, 2016

Commits on Aug 28, 2016

AST: Introduce new GenericEnvironment class
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AST: Use GenericEnvironment in ArchetypeBuilder::mapType{Into,OutOf}Context()
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SIL: Replace SILFunction::ContextGenericParams with a GenericEnvironment
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AST: Nuke GenericParamList versions of ArchetypeBuilder::mapType{Into,OutOf}Context()
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AST: Nuke ProtocolConformance::getGenericParams()
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Serialization: Remove support for serializing GenericParamList from SIL
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AST: Nuke GenericParamList::AllArchetypes
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Sema: Simplify unqualified lookup from protocol extensions
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Sema: Change a few isGenericContext() checks to getGenericSignatureOfContext()
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Fixed SIL crashers
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Teach resolve-crashers.py to resolve SIL crashers
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Sema: Targeted fix for a crasher that regressed with AllArchetypes changes
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XFAIL a crasher that no longer crashes with removal of AllArchetypes
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