[ObjC] Make sure that the implicit arguments for direct methods have … #432
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…been setup
This commit sets the Self and Imp declarations for ObjC method declarations,
in addition to the definitions. It also fixes
a bunch of code in clang that had wrong assumptions about when getSelfDecl() would be set:
set for method declarations part of a protocol, which they never were,
and that self would be a Class type, which it isn't as it is id for a protocol.
Also use the Canonical Decl to index the set of Direct methods so that
when calls and implementations interleave, the same llvm::Function is
used and the same symbol name emitted.
Radar-Id: rdar://problem/57661767
Patch by: Pierre Habouzit
Differential Revision: https://reviews.llvm.org/D71091