Revert "[ASan][libc++] Turn on ASan annotations for short strings (#79049)"

This reverts commit cb528ec5.

Reason: buildbot breakage (https://lab.llvm.org/buildbot/#/builders/5/builds/40364):
SUMMARY: AddressSanitizer: container-overflow /b/sanitizer-x86_64-linux-fast/build/libcxx_build_asan_ubsan/include/c++/v1/string:1870:29 in __get_long_pointer