crt: Add ARM64EC setjmp and longjmp implementation #34

Job	Run time
llvm-mingw (ucrtbase)	23m 56s
llvm-mingw (ucrt)	23m 25s
llvm-mingw (msvcrt)	23m 45s
gcc (msvcrt, x86_64)	20m 21s
gcc (msvcrt, i686)	19m 41s
gcc (ucrt, i686)	19m 28s
gcc (ucrt, x86_64)	20m 10s
gcc-cross (ucrt, i686)	17m 18s
gcc-cross (msvcrt, x86_64)	17m 47s
gcc-cross (msvcrt, i686)	17m 14s
gcc-cross (ucrt, x86_64)	17m 43s
test-llvm-mingw (x86_64, ucrtbase)	3m 35s
test-libcxx (x86_64)	1h 15m 9s
test-llvm-mingw (x86_64, ucrt)	3m 35s
test-libcxx (x86_64, i686-w64-mingw32-)	1h 14m 40s
test-llvm-mingw (x86_64, msvcrt)	3m 35s
test-llvm-mingw (i686, msvcrt)	3m 36s
linux-test-cross-build-ffmpeg (aarch64)	4m 42s
test-ffmpeg (x86_64)	17m 48s
linux-test-cross-build-ffmpeg (i686)	4m 52s
linux-test-cross-build-ffmpeg (x86_64)	5m 39s
test-ffmpeg (i686)	17m 13s
test-llvm-mingw (i686, ucrt)	3m 36s
test-llvm-mingw (i686, ucrtbase)	3m 42s
linux-test-cross-build-ffmpeg (armv7)	4m 15s
test-gcc (ucrt, x86_64)	39s
test-gcc (ucrt, i686)	41s
test-gcc (msvcrt, x86_64)	39s
test-gcc (msvcrt, i686)	39s
	7h 29m 23s

Provide feedback