Improve `InlineAsmOperand` #7987

Job	Run time
build-and-check-clang-macos	37m 4s
build-and-check-gcc-48	28m 16s
build-and-check-ubuntu-32bit	25m 34s
build-and-check-ubuntu-64bit	25m 13s
build-and-check-ubuntu-64bit-glibcxx	26m 34s
build-and-check-asan	31m 40s
	2h 54m 21s

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