Merge pull request #2128 from albinahlback/mpn_extras_inline #2908

Job	Run time
Alpine Linux, musl, 32-bit (assert, x1.5)	14m 9s
GCC build regression check (no tests)	4m 39s
macOS-M1, Clang (x3)	7m 59s
Nemo.jl	17m 5s
MinGW GCC (x0.5)	10m 43s
MSVC (x1)	26m 25s
Ubuntu GCC, Code Coverage (x10)	30m 25s
Ubuntu Clang, BLAS and examples (x5)	12m 33s
Ubuntu GCC with NTL (assert, x2)	7m 59s
	2h 11m 57s

Provide feedback