[Sanitizer] Clean up SANITIZER_CAN_USE_ALLOCATOR64 logic #6232
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Update: A change to this code recently broke our bots after this change enabled the 64 bit allocator for defined(aarch64): https://reviews.llvm.org/D137136
We added logic initially to get our test passing, but want to further clean up this code to enable MacOS to use allocator64 and increase readability and clarity of the logic.
rdar://103647896
Differential Revision: https://reviews.llvm.org/D141171
(cherry picked from commit 87850e9)