Evan Wilde c1d787e473 Swift: Add abstraction for compilation mode ...

Add a `CMAKE_Swift_COMPILATION_MODE` variable and corresponding
`Swift_COMPILATION_MODE` target property to control the compilation
mode.  Select among `wholemodule`, `singlefile`, and `incremental`.

Add policy CMP0157 to remove the default `-wmo` flags in favor of the
abstract setting.

Issue: #25366

2023-11-17 08:43:21 -05:00

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