x86_64: Optimize accumulating of integer segments #4470

Job	Run time
Event File	3s
Build Erlang/OTP (64-bit)	8m 41s
Build Erlang/OTP (iOS)	4m 13s
Build Erlang/OTP (32-bit)	8m 42s
Build Erlang/OTP (Types and Flavors)	10m 38s
Build Erlang/OTP (cross-compile)	15m 26s
Build Erlang/OTP (macOS)	2m 53s
Build Erlang/OTP (clang)	5m 22s
Build Erlang/OTP (Windows)	19m 10s
Build and check documentation	4m 59s
Run static analysis	6m 41s
Test Erlang/OTP (emulator)	47m 46s
Test Erlang/OTP (debug)	4m 13s
Test Erlang/OTP (dialyzer)	14m 5s
Test Erlang/OTP (kernel)	1h 24m 4s
Test Erlang/OTP (megaco)	30m 54s
Test Erlang/OTP (ssh)	17m 19s
Test Erlang/OTP (ssl)	29m 46s
Test Erlang/OTP (stdlib)	1h 6m 8s
Test Erlang/OTP (syntax_tools)	3m 3s
Test Erlang/OTP (tools)	4m 56s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	8m 47s
	6h 37m 49s

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