[PATCH] Remove duplicated code for reading control registers

[Glauber de Oliveira Costa]

Tiny cleanup:

In x86_64, the same functions for reading cr3 and writing cr{3,4} are
defined in tlbflush.h and system.h, whith just a name change.
The only difference is the clobbering of memory, which seems a safe, and
even needed change for the write_cr4. This patch removes the duplicate.
write_cr3() is moved to system.h for consistency.

Signed-off-by: Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>

-- 
Glauber de Oliveira Costa
Red Hat Inc.
"Free as in Freedom"
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