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b0015627610a311997ab21b8b295a8168b5915ec by Derek Mauro <dmauro@google.com>:

Add an empty log_severity library. The log_severity sources will
eventually migrate here once users are updated to depend on the new
target.

Note that no opensource user should be depending on log_severity.h
today since it has no purpose in opensource.

PiperOrigin-RevId: 258781702

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c4d8d03f731d1de648ef2d17a55c3a16029ba331 by Derek Mauro <dmauro@google.com>:

Move atomic_hook.h to its own internal target.

PiperOrigin-RevId: 258765527
GitOrigin-RevId: b0015627610a311997ab21b8b295a8168b5915ec
Change-Id: I0ec9b8b3cb6a27dc32a5f6c318d07e02548f193d