Add Support for POWER11 #5853

Job	Run time
neoverse_build	8m 16s
msys2 (UCRT64, int64, Release)	1h 40m 3s
msys2 (CLANG64, int32, Release)	16m 24s
msys2 (MINGW32, int32, Release)	1h 7m 54s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	1h 28m 11s
msys2 (CLANG64, int64, Release)	16m 7s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	2m 32s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	3m 39s
msys2 (UCRT64, int32, Release)	1h 39m 15s
build (ubuntu-latest, gfortran, cmake)	45m 0s
build (ubuntu-latest, flang, make)	5m 34s
build (ubuntu-latest, gfortran, make)	21m 32s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	3m 34s
build (macos-latest, gfortran, cmake)	15m 10s
build (ubuntu-latest, flang, cmake)	46m 14s
build (macos-latest, gfortran, make)	4m 42s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	3m 6s
	9h 7m 13s

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