/usr/share/X11/locale/ja.JIS/XI18N_OBJS is in libx11-data 2:1.6.3-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # CATEGORY(XLC|XIM|OM) SHARED_LIBRARY_NAME FUNCTION_NAME
#
# XI18N objects table for ja.JIS locale
#
XLC common/xlibi18n _XlcGenericLoader # XLC_open
XIM common/ximcp _XimOpenIM _XimRegisterIMInstantiateCallback _XimUnRegisterIMInstantiateCallback # XIM_open XIM_register XIM_unregister
XOM common/xomGeneric _XomGenericOpenOM # XOM_open
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