[sanitizer] Let glibc aarch64 use O(1) GetTls

The generic approach can still be used by musl and FreeBSD. Note: on glibc
2.31, TLS_PRE_TCB_SIZE is 0x700, larger than ThreadDescriptorSize() by 16, but
this is benign: as long as the range includes pthread::{specific_1stblock,specific}
pthread_setspecific will not cause false positives.

Note: the state before afec953857ffd682cb4119e7950f3593efbaaa81 underestimated
the TLS size a lot (nearly ThreadDescriptorSize() = 1776).
That may explain why afec953857ffd682cb4119e7950f3593efbaaa81 actually made some
tests pass.

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