[6.0][PackageLoading] Support deserialization of manifests that used `swif… #7828
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…tLanguageVersion`
Explanation:
Follow-up to Adopt language mode naming in
PackageDescription
API #7620This is important for the manifest cache - make sure that older manifests that used original spelling of the build setting are still deserializable.
Main Branch PR: [PackageLoading] Support deserialization of manifests that used `swif… #7827
Resolves: rdar://132484168
Risk: Very Low (This change is very narrow and affects only people who adopted
swiftLanguagVersion
while building with 6.0 snapshot and had their manifests cached).Reviewed By: @bnbarham
Testing: Local testing only since there are no convenient affordances to test this.
(cherry picked from commit 5189086)