IMPALA-1572: backout attempt to execute SSSE3 instruction

Executing the MMX instruction had the unaccounted for side-effect
of reseting the FPU tag word, which caused FPU corruption in
Java code (String.format("%f")).  The safest fix is to backout
the attempt to execute the instruction.

Change-Id: I5eb5819574966e73f61b5cb3f340da32c71d0851
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5506
Reviewed-by: Ippokratis Pandis <ipandis@cloudera.com>
Tested-by: jenkins