Add `Process::Status#abnormal_exit?` (#15266) #13026

Job	Run time
check_format	1m 42s
x86_64-gnu-test (1.7.3)	34m 46s
x86_64-gnu-test (1.8.2)	34m 18s
x86_64-gnu-test-preview_mt	5m 47s
x86_64-gnu-test (1.9.2)	34m 54s
x86_64-gnu-test (1.10.1)	35m 28s
x86_64-gnu-test (1.11.2)	35m 0s
x86_64-gnu-test (1.12.2)	36m 9s
x86_64-gnu-test (1.13.3)	34m 0s
x86_64-musl-test	37m 19s
x86_64-gnu-test (1.14.0)	33m 47s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	32m 50s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 49s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	33m 57s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	10m 46s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	33m 57s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	35m 20s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	32m 5s
	8h 55m 54s

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