WIP: x86_64: Optimize arithmetic instructions #3090

Job	Run time
Build Erlang/OTP (64-bit)	16m 59s
Event File	3s
Build Erlang/OTP (32-bit)	10m 41s
Build Erlang/OTP (macOS)	7m 53s
Build Erlang/OTP (cross-compile)	13m 10s
Build Erlang/OTP (iOS)	9m 36s
Build Erlang/OTP (Types and Flavors)	9m 5s
Build Erlang/OTP (clang)	5m 38s
Build Erlang/OTP (Windows)	13m 59s
Build and check documentation	8m 21s
Run static analysis	3m 0s
Test Erlang/OTP (emulator)	45m 8s
Test Erlang/OTP (debug)	5m 10s
Test Erlang/OTP (compiler)	9m 8s
Test Erlang/OTP (stdlib)	34m 41s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	9m 16s
	3h 21m 48s

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