The early swift driver build fails in the release/6.1 branch

[hjyamauchi]

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The early swift build fails with this error:

<unknown>:0: error: supplementary output file map 'C:\\Users\\runner\\AppData\\Local\\Temp\\TemporaryDirectory.FlQaqL\\supplementaryOutputs-1' is missing an entry for 'D:\\r\\_work\\swift-build\\swift-build\\SourceCache\\swift-driver\\Sources\\SwiftDriver\\Driver\\CompilerMode.swift' (this likely indicates a compiler issue; please submit a bug report (https://swift.org/contributing/#reporting-bugs))

This isn't locally reproducible.

A temporary workaround is to disable wmo.