LLVM, as of 77e0e9e17daf0865620abcd41f692ab0642367c4, now builds with
-Wsuggest-override. Let's clean up the swift sources rather than disable
the warning locally.
SIL differentiability witnesses are a new top-level SIL construct mapping
an "original" SIL function and derivative configuration to derivative SIL
functions.
This patch adds `SILDifferentiabilityWitness` IRGen.
`SILDifferentiabilityWitness` has a fixed `{ i8*, i8* }` layout:
JVP and VJP derivative function pointers.
Resolves TF-1146.
Structurally prevent a number of common anti-patterns involving generic
signatures by separating the interface into GenericSignature and the
implementation into GenericSignatureBase. In particular, this allows
the comparison operators to be deleted which forces callers to
canonicalize the signature or ask to compare pointers explicitly.
When we canonicalize a generic signature, ensure that the resulting
signature has canonical requirements in the appropriate order.
More validation for generic signature canonicalization as part of the
ABI, which is tracked by SR-3733 / rdar://problem/31412994.
This should help give a slightly better experience for out-of-order
type checking issues until we manage to make type checking
order-independent. <rdar://problem/14702636>.
Swift SVN r7149
