Jay Petacat fd43baa9ad byos: Ease GeneralPurposeAllocator integration ...

These changes enable me to use `GeneralPurposeAllocator` with my "Bring
Your Own OS" package. The previous checks for a freestanding target have
been expanded to `@hasDecl` checks.

- `root.os.heap.page_allocator` is used if it exists.
- `debug.isValidMemory` only calls `os.msync` if it's supported.

2024-01-16 15:05:38 -08:00

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