[NFC][asan] Update shadow mapping comments for AArch64 non-Android Linux (#152412) This adds commentary to explain why ASan does not work for AArch64 non-Android Linux with 39-bit and 42-bit VMAs (e.g., https://github.com/llvm/llvm-project/issues/145259). Additionally, it updates the 42-bit VMA shadow map comment, which has been outdated for the last 10 years (18b2258c92df93c83bc7fce94c20baff3c06e2c6 changed 39-bit and 42-bit to use the same offset), and adds a comment for the 48-bit VMA shadow map.
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