llvmpipe: Always use floating-point operators for floating-point types
llvmpipe: Always use floating-point operators for floating-point types

See:
http://bugs.freedesktop.org/29404
http://bugs.freedesktop.org/29407

Signed-off-by: José Fonseca <61b5a29db2c0650f7c8510f93eece059c1b09320@vmware.com>

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