The assembler in most versions of Mac OS X is pretty old and does not
support the xgetbv instruction.  To go around this problem, the raw
encoding of the instruction is used instead.
Signed-off-by: NJohn Arbuckle <programmingkidx@gmail.com>
Message-Id: <20180604215102.11002-1-programmingkidx@gmail.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>