Improve DIMASSOC object #4667

Job	Run time
mips32-big-endian	28m 3s
linux-cmake	5m 9s
macOS	13m 10s
linux (CFLAGS="-O1 -fno-omit-frame-pointer -fsanitize=address -fno-var-tracking" --disable-bindin...	9m 4s
mingw-cmake	7m 3s
linux (CC="clang")	6m 23s
mingw	30m 17s
ppc64-big-endian	12m 56s
linux (--enable-release)	25m 14s
linux (--enable-gcov --disable-bindings --disable-docs CFLAGS="-O0 -g")	4m 44s
vs2019	4m 59s
linux (--disable-write --disable-docs)	6m 22s
vs2019-ninja	4m 19s
linux (CFLAGS="-O2 -m32" --disable-bindings --disable-docs)	7m 16s
linux (CFLAGS="-O2 -fno-omit-frame-pointer -fsanitize=undefined -fno-var-tracking" --disable-bind...	20m 25s
	3h 5m 24s

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