Fix kBlockCacheTier read when merge-chain base value is in a blob file #1039

Job	Run time
build-linux	15m 24s
build-linux-cmake-with-folly	24m 3s
check-format-and-targets	30s
build-linux-cmake-mingw	11m 48s
build-linux-clang-13-no_test_run	6m 48s
build-fuzzers	8m 12s
build-linux-clang-no_test_run	11m 26s
build-examples	10m 9s
build-linux-cmake-with-benchmark	17m 49s
build-linux-cmake-with-folly-coroutines	25m 46s
build-linux-cmake-with-folly-lite-no-test	7m 25s
build-linux-encrypted_env-no_compression	14m 17s
build-linux-gcc-10-cxx20-no_test_run	8m 34s
build-linux-gcc-8-no_test_run	8m 6s
build-linux-gcc-7-with-folly-lite-no-test	7m 26s
build-linux-release	12m 56s
build-linux-release-rtti	12m 1s
build-linux-clang10-asan	14m 55s
build-linux-gcc-7-with-folly	22m 18s
build-linux-clang10-clang-analyze	16m 13s
build-linux-clang10-mini-tsan	21m 2s
build-linux-clang10-ubsan	14m 24s
build-linux-gcc-11-no_test_run	9m 14s
build-linux-java	14m 24s
build-linux-java-pmd	11m 35s
build-linux-java-static	11m 17s
build-linux-mini-crashtest	28m 20s
build-linux-static_lib-alt_namespace-status_checked	17m 14s
build-linux-unity-and-headers	12m 1s
build-macos	23m 5s
build-macos-cmake (true)	40m 35s
build-macos-java	14m 3s
build-macos-cmake (false)	56m 39s
build-macos-java-static	19m 29s
build-macos-java-static-universal	20m 10s
build-windows-vs2019	49m 56s
	10h 19m 34s

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