better handling of std/eastl::make_pair #3757

Job	Run time
macOS / release / homebrew-clang	5m 23s
Windows / debug / msvc	18m 23s
macOS / release / system-clang	3m 38s
macOS / debug / system-clang	5m 55s
Windows / release / msvc	16m 0s
Windows / release / llvm	13m 28s
Windows / debug / llvm	14m 0s
Windows / debug / clang-cl	12m 40s
Windows / release / clang-cl	15m 3s
macOS / debug / homebrew-clang	5m 21s
	1h 49m 51s

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