[clang] Upstream visionOS Availability & DarwinSDKInfo APIs (#84279) #8358
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Admittedly a bit awkward,
visionos
is the correct and accepted spelling for annotating availability for xrOS target triples. This patch detects errors and handles cases whenxros
is mistakenly passed. In addition, add APIs for introduced/deprecated/obsoleted versioning in DarwinSDKInfo mappings.(cherry picked from commit 9cf9cb2)