Alexis Laferrière 1e4fe67f40 Serialization: restrict swiftmodules to distribution channels ...

There are scenarios where different compilers are distributed with
compatible serialization format versions and the same tag. Distinguish
swiftmodules in such a case by assigning them to different distribution
channels. A compiler expecting a specific channel will only read
swiftmodules from the same channel. The channels should be defined by
downstream code as it is by definition vendor specific.

For development, a no-channel compiler loads or defining the env var
SWIFT_IGNORE_SWIFTMODULE_REVISION skips this new check.

rdar://123731777

2024-03-01 10:52:44 -08:00

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