Try to fix remaining ASAN-reported leaks #7767
Merged
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This fixes all but one of the known remaining ASAN-related leaks; the remaining is in
tutorial_lesson_19_wrapper_funcs
I can't debug that one locally because the leaks are in OpenCL and I am temporarily relegated to using a 'cloud' machine with no real GPU for linux-x64 -- if someone with access to such a machine could take a look, I'd appreciate it (examples of leakage at https://buildbot.halide-lang.org/master/#/builders/154/builds/79/steps/12/logs/tutorial_lesson_19_wrapper_funcs)
Also, drive-by change to turn off CCache for sanitizer builds in the presets files -- we are already doing this on the buildbots via config script, but doing it in the presets is good too for people who want to use it locally (for reasons that aren't entirely clear, CCache and sanitizers don't like each other)