fix: buffer pool redundant allocation #196

Job	Run time
build (darwin, amd64)	45s
build (darwin, arm64)	43s
build (android, arm64)	41s
build (linux, amd64)	43s
build (linux, arm64)	43s
build (linux, arm, 7)	45s
build (linux, riscv64)	51s
build (linux, mips64)	43s
build (linux, mips64le)	51s
build (linux, mips)	43s
build (linux, mipsle)	49s
build (linux, mips64, softfloat)	45s
build (linux, mips64le, softfloat)	49s
build (linux, mips, softfloat)	45s
build (linux, mipsle, softfloat)	49s
build (windows, amd64)	50s
build (windows, arm64)	43s
build (windows, 386)	42s
	13m 40s

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