[ur] optimize align allocation in DisjointPool (#625) #1642

Job	Run time
Build - Ubuntu (ubuntu-20.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF)	5m 47s
Build - Ubuntu (ubuntu-20.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF)	5m 28s
Build - Ubuntu (ubuntu-22.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF)	5m 13s
Build - Ubuntu (ubuntu-22.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF)	5m 45s
Build - Ubuntu (ubuntu-22.04, Release, clang, clang++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF)	6m 1s
Build - Ubuntu (ubuntu-22.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=ON)	6m 34s
Build - Ubuntu (ubuntu-22.04, Release, clang, clang++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=ON)	8m 38s
Build - Ubuntu (ubuntu-20.04, Release, gcc-7, g++-7)	6m 16s
Build - Windows (windows-2019, Debug)	9m 55s
Build - Windows (windows-2019, Release)	10m 22s
Build - Windows (windows-2022, Debug)	12m 44s
Build - Windows (windows-2022, Release)	15m 5s
	1h 37m 48s

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