[Driver] SR-3352: Warn on and ignore -embed-bitcode when not generating object files #7962
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Commands like -emit-sil and -emit-module (on its own) do not produce object files.
When -embed-bitcode is also set, the driver runs a backend job to generate a module that fails.
This commit emits a warning instead and ignores the -embed-bitcode option.
https://bugs.swift.org/browse/SR-3352