Erik Eckstein 6df033b298 SIL: only use canonical substitution maps in SIL ...

* When constructing instructions which have substitution maps: initialize those with the canonical SubstitutionMap
* Also initialize SILFunction::ForwardingSubMap with the canonical one

Non-canonical substitution maps may prevent generic specializations.
This fixes a problem in Embedded Swift where an error is given because a function cannot be specialized, although it should.

https://github.com/swiftlang/swift/issues/83895
rdar://159065157

2025-08-29 22:31:04 +02:00

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