swift234

[AST] Refactor implementation for ValueDecl::getSatisfiedProtocolRequirements().

Move the map that keeps track of conforming decl -> requirement from ASTContext
to a nominal type's ConformanceLookupTable, and populate it lazily.

This allows getSatisfiedProtocolRequirements() to work with declarations from module files.
Test on the SourceKit side.

Part of rdar://20526240.

Swift SVN r27353