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No longer use register names in I/O space for ldi operands #2976

Job	Run time
linux-x86_64-autotools	2m 36s
linux-x86_64	2m 23s
macos-arm64	1m 11s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 27s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 27s
msvc (arm64, ARM64)	1m 18s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 24s
msvc (x86, Win32)	1m 25s
msvc (x64, x64)	1m 48s
mingw (ucrt64, ucrt-x86_64)	3m 14s
macos-arm64-autotools	1m 4s
mingw (mingw64, x86_64)	3m 3s
mingw (clang64, clang-x86_64)	3m 28s
	25m 48s

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