Remove bias in Unbiased ReSTIR due to visibility reuse #964

Job	Run time
macos-13 / Release / homebrew-clang	0s
macos-13 / Debug / homebrew-clang	23m 20s
ubuntu-22.04 / Release / gcc-11	19m 10s
windows-2019 / Release / cl	43m 27s
ubuntu-22.04 / Debug / gcc-11	16m 49s
windows-2019 / Release / clang	41m 51s
ubuntu-22.04 / Release / gcc-12	22m 4s
windows-2019 / Release / clang-cl	41m 14s
ubuntu-22.04 / Debug / gcc-12	18m 56s
windows-2019 / Debug / cl	33m 16s
ubuntu-22.04 / Release / gcc-13	28m 10s
windows-2019 / Debug / clang	41m 34s
ubuntu-22.04 / Debug / gcc-13	25m 2s
windows-2019 / Debug / clang-cl	39m 44s
ubuntu-22.04 / Release / clang-14	18m 56s
windows-2022 / Release / cl	42m 54s
ubuntu-22.04 / Debug / clang-14	15m 5s
windows-2022 / Release / clang	45m 56s
ubuntu-22.04 / Release / clang-15	19m 9s
windows-2022 / Release / clang-cl	56m 59s
ubuntu-22.04 / Debug / clang-15	15m 17s
windows-2022 / Debug / cl	36m 23s
ubuntu-22.04 / Release / clang-16	19m 39s
ubuntu-22.04 / Debug / clang-16	16m 13s
windows-2022 / Debug / clang	40m 18s
ubuntu-22.04 / Release / clang-17	1m 43s
windows-2022 / Debug / clang-cl	55m 55s
ubuntu-22.04 / Debug / clang-17	22m 26s
	13h 21m 30s

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