Add GDB support #7567

Job	Run time
Sparse check	2m 49s
GCC static -fanalyzer	3m 43s
GCC build X86_64 with W=1	3m 10s
GCC build X86_64 with W=1 allmodconfig	1m 35s
GCC build i386	16m 3s
GCC build arm64	19m 22s
GCC build X86_64	20m 9s
Clang build x86_64	4m 6s
GCC build arm64 allmodconfig	3m 7s
	1h 14m 4s

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