Move self_greater to the is_greater callable #2573

Job	Run time
no_pch (clang, x86, -msse2)	59m 15s
no_pch (gcc, x86, -msse2)	58m 22s
arm (clang, aarch64, -Wno-psabi)	33m 33s
externals (clang, x86, -msse2)	46m 2s
macosx (clang, x86_osx, -mavx)	1h 40m 43s
arm (clang, arm, -Wno-psabi)	34m 34s
externals (gcc, x86, -msse2)	51m 7s
riscv (clang, riscv, -mrvv-vector-bits=128)	34m 54s
nosimd (clang, x86, -DEVE_NO_SIMD)	41m 2s
x86-clang (clang, x86, -msse4.2)	16m 23s
nosimd (gcc, x86, -DEVE_NO_SIMD)	45m 56s
x86-clang (clang, x86, -mavx)	19m 51s
x86-clang (clang, x86, -mavx2)	18m 50s
other-arch (gcc, sve256, -Wno-psabi)	1h 7m 25s
other-arch (gcc, sve512, -Wno-psabi)	2h 33m 18s
other-arch (gcc, ppc64, -Wno-psabi)	40m 50s
avx512 (clang, x86, -march=skylake-avx512)	35m 45s
avx512 (gcc, x86, -march=skylake-avx512)	57m 40s
x86-gcc (gcc, x86, -msse4.2)	20m 21s
x86-gcc (gcc, x86, -mavx)	25m 0s
x86-gcc (gcc, x86, -mavx2)	24m 23s
other-cases (clang_libcpp, x86, -msse2)	24m 44s
other-cases (clang, x86, -mavx2 -mbmi2 -DEVE_USE_BMI_ON_AVX2)	27m 31s
other-cases (gcc, x86, -mavx2 -mbmi2 -DEVE_USE_BMI_ON_AVX2)	54m 35s
	18h 12m 4s

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