[ASan][Windows] Fixing Windows shadow memory address for arm64 (#184902)

This is a prerequisite for full ARM64 Windows ASan support. The runtime
interception changes needed to make ASan functional end-to-end on ARM64
Windows will be opened separately.

Motivated by https://github.com/microsoft/STL/pull/6095 (more
specifically [this reference to
clang-cl](https://github.com/microsoft/STL/pull/6095#:~:text=Not%20enabling%20GH_002030_asan_annotate_string%20and%20GH_002030_asan_annotate_vector%20yet%20due%20to%20Clang%20issues.))

The latest MSVC toolset includes ARM64 AddressSanitizer support. This
change adds AArch64 to the Windows 64-bit shadow mapping condition when
compiling with `-fsanitize=address` with `clang-cl`. Without this,
consumers on Windows who target ARM64 with `clang-cl -fsanitize=address`
and then link with `link.exe` will see this at runtime:

```text
ERROR: AddressSanitizer: access-violation on unknown address
...
```

since the shadow memory offset is not properly assigned. Windows ARM64
uses the same dynamic shadow allocation strategy as x64 via
`__asan_shadow_memory_dynamic_address`.