[RFC 3/3] x86, mirror: x86 enabling - find mirrored memory ranges and tell memblock

[Tony Luck]

Can't post this part yet because it uses things in an upcoming[*] ACPI, UEFI, or some
other four-letter-ending-in-I standard.  So just imagine a call someplace early
in startup that reads information about mirrored address ranges and does:

+	for (...) {
+		start = ...;
+		size = ...;
+		if (it looks mirrored)
+			memblock_mark_mirror(start, size);
+	}

Whole patch is pretty tiny:

 3 files changed, 19 insertions(+)

How much damage could I possibly do in just 19 lines?

-Tony

[*] very soon, I'm told
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