Bug swiftshader:64

Change-Id: Ice0e96934bae8628a14d628fd02046fc81f7a0ab
Reviewed-on: https://swiftshader-review.googlesource.com/c/19608Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>