swift

2c5b4301 - Merge tag 'swift-DEVELOPMENT-SNAPSHOT-2019-10-13-a' into tensorflow-merge2

Merge tag 'swift-DEVELOPMENT-SNAPSHOT-2019-10-13-a' into tensorflow-merge2 Tag build swift-DEVELOPMENT-SNAPSHOT-2019-10-13-a Simple merge including conflicts. Conflicts: include/swift/AST/ASTContext.h include/swift/AST/IndexSubset.h include/swift/Parse/Parser.h lib/AST/ASTContext.cpp lib/AST/CMakeLists.txt lib/AST/IndexSubset.cpp lib/Sema/TypeCheckDecl.cpp unittests/AST/CMakeLists.txt unittests/AST/IndexSubsetTests.cpp