[libc++][ranges] P1223R5: `find_last` #4998

Job	Run time
stage1 (generic-cxx03, clang-19, clang++-19)	8m 17s
stage1 (generic-cxx26, clang-19, clang++-19)	12m 31s
stage1 (generic-modules, clang-19, clang++-19)	9m 11s
stage1 (generic-gcc, gcc-14, g++-14)	15m 58s
windows (clang-cl-dll, false)	51m 7s
stage2 (generic-cxx11, clang-19, clang++-19)	8m 16s
windows (clang-cl-static, false)	54m 1s
stage2 (generic-cxx14, clang-19, clang++-19)	9m 39s
windows (clang-cl-no-vcruntime, false)	50m 31s
stage2 (generic-cxx17, clang-19, clang++-19)	9m 45s
windows (clang-cl-debug, false)	51m 21s
stage2 (generic-cxx20, clang-19, clang++-19)	1m 56s
windows (clang-cl-static-crt, false)	54m 42s
stage2 (generic-cxx23, clang-19, clang++-19)	14m 34s
windows (mingw-dll, true)	1h 9m 40s
stage2 (generic-gcc-cxx11, gcc-14, g++-14)	7m 13s
windows (mingw-static, true)	1h 10m 54s
stage2 (generic-cxx23, clang-17, clang++-17)	2m 37s
windows (mingw-dll-i686, true)	1h 11m 35s
stage2 (generic-cxx26, clang-18, clang++-18)	11m 23s
stage3	0s
	9h 45m 11s

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