plugin_lint_mac fails, error: failed to load module 'Swift' #73606
Description
[plugin_lint_mac] [STDOUT] stdout: /opt/s/w/ir/cache/osx_sdk/XCode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.0.sdk/usr/lib/swift/Swift.swiftmodule/armv7-apple-ios.swiftinterface:21488:21: error: module 'Builtin' has no member named 'convertUnownedUnsafeToGuaranteed'
[plugin_lint_mac] [STDOUT] stdout: return try body(Builtin.convertUnownedUnsafeToGuaranteed(fakeBase,
[plugin_lint_mac] [STDOUT] stdout: ^~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[plugin_lint_mac] [STDOUT] stdout: <unknown>:0: error: failed to load module 'Swift'
[plugin_lint_mac] [STDOUT] stdout: Command CompileSwift failed with a nonzero exit code
Swift symbols missing again? #72823
Same failure in mac_build_ios_framework_module_test and mac_plugin_lint_mac
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20build_ios_framework_module_test/1226/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20plugin_lint_mac/1218/overview