These tests were added in:1daa48f00559e422c90bmalloc_zero.c and realloc_too_big.c fail when only leak sanitizer is enabled. http://lab.llvm.org:8011/#/builders/59/builds/1635 (also in an armv8 32 bit build) (I would XFAIL them but the same test is run with address and leak sanitizer enabled and that one does pass)
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