encode: section_order adjust num_sections internally #4014

Job	Run time
ppc64-big-endian	6m 41s
linux-cmake	4m 15s
macOS	15m 39s
linux (CFLAGS="-O0 -fno-omit-frame-pointer -fsanitize=address -fno-var-tracking" --disable-bindings)	8m 35s
mingw	21m 43s
mingw-cmake	7m 43s
linux (CC="clang")	9m 56s
mips32-big-endian	18m 16s
linux (--enable-release)	20m 15s
vs2019	5m 11s
linux (--enable-gcov --disable-bindings)	16m 59s
vs2019-ninja	5m 9s
linux (--disable-write)	8m 56s
linux (CFLAGS="-O2 -m32" --disable-bindings)	10m 7s
linux (CFLAGS="-O2 -fno-omit-frame-pointer -fsanitize=undefined -fno-var-tracking" --disable-bind...	17m 52s
	2h 57m 17s

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