[cairo] [PATCH] Rely less on FPU for common matrix funcs.

[Jonathan Morton]

Revised patch attached.

This one uses the slightly dirtier (and faster) method for
_cairo_matrix_is_translate().

It also replaces cairo_matrix_init_identity() with a straight copy from
a global constant reference (it becomes a series of load/store-multiple
instructions).  This reduces it's substantial contribution to our
profile by about half.

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From: Jonathan Morton
      jonathan.morton at movial.com