add toggle to disable confdata soft OOM degradation mode (#966) #288

Job	Run time
jammy/g++/c++17/asan=off/ubsan=off	8m 26s
focal/clang++/c++17/asan=off/ubsan=on	8m 10s
focal/g++-10/c++20/asan=on/ubsan=off	9m 35s
	26m 11s

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