CONFIG_DEBUG_UNCOMPRESS is not available for the selected architecture x86.
Result is shown for architecture arm

Enable decompressor debugging via DEBUG_LL output

configname: CONFIG_DEBUG_UNCOMPRESS

Linux Kernel Configuration
└─>Enable decompressor debugging via DEBUG_LL output
In linux kernel since version 3.1 (release Date: 2011-10-24)
Say Y here to enable debug output in the decompressor code, using
the selected DEBUG_LL output method.