Swift: Disable optimization when compiling in Debug

David Geldreichrequested to merge
r2d3/cmake:swift_debug into master

By default no -O... flag is specified for Debug configuration for Swift so Xcode adds a (wrong) -O flag that prevents one from accessing variables while debugging. Add -Onone to the Swift Debug configuration to avoid this.

Fixes: #23818 (closed)

Edited by Brad King

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