Merge valgrind 3.26.0 from upstream #112

Job	Run time
benchmarks (echo Hello, World!, 3.26.0)	2m 30s
benchmarks (echo Hello, World!, 3.25.1)	2m 33s
benchmarks (echo Hello, World!, local)	2m 59s
benchmarks (testdata/take_strings-aarch64 varbinview_non_null, local)	3m 36s
benchmarks (python3 testdata/test.py, 3.26.0)	20m 17s
benchmarks (testdata/take_strings-aarch64 varbinview_non_null, 3.25.1)	3m 26s
benchmarks (stress-ng --cpu 1 --cpu-ops 10, 3.26.0)	3m 28s
benchmarks (python3 testdata/test.py, 3.25.1)	3m 55s
benchmarks (stress-ng --cpu 1 --cpu-ops 10, 3.25.1)	3m 23s
benchmarks (stress-ng --cpu 4 --cpu-ops 10, 3.26.0)	2m 43s
benchmarks (stress-ng --cpu 4 --cpu-ops 10, 3.25.1)	2m 41s
benchmarks (stress-ng --cpu 1 --cpu-ops 10, local)	3m 50s
benchmarks (stress-ng --cpu 4 --cpu-ops 10, local)	3m 11s
benchmarks (python3 testdata/test.py, local)	3m 52s
benchmarks (testdata/take_strings-aarch64 varbinview_non_null, 3.26.0)	4m 41s
	1h 7m 5s

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