[Do not review!] README: Add Test at the end #6863

Job	Run time
Clang build x86_64	4m 18s
GCC build arm64 allmodconfig	1m 52s
GCC static -fanalyzer	4m 16s
GCC build arm64	16m 55s
GCC build i386	14m 42s
GCC build X86_64	16m 55s
GCC build X86_64 with W=1	2m 48s
GCC build X86_64 with W=1 allmodconfig	1m 55s
Sparse check	3m 2s
	1h 6m 43s

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