Produce split debuginfo in .dwo files

configname: CONFIG_DEBUG_INFO_SPLIT

Linux Kernel Configuration
└─>Kernel hacking
└─>Compile-time checks and compiler options
└─>Produce split debuginfo in .dwo files
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Generate debug info into separate .dwo files. This significantly
reduces the build directory size for builds with DEBUG_INFO,
because it stores the information only once on disk in .dwo
files instead of multiple times in object files and executables.
In addition the debug information is also compressed.

Requires recent gcc (4.7+) and recent gdb/binutils.
Any tool that packages or reads debug information would need
to know about the .dwo files and include them.
Incompatible with older versions of ccache.

depends
CONFIG_DEBUG_INFO
CONFIG_cc-option