/usr/include/kerngen/iallbl.inc is in libkernlib1-dev 20061220+dfsg3-4.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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C- - PARAMETER (IALLBL = X'20202020')
PARAMETER (IALLBL = 538976288 )
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