mi: Mark the span blit routines as _X_COLD

On gcc, __attribute__((cold)) means:

- consider calls to the function to be unlikely for branch prediction
- optimize the function for size
- emit the function in a dedicated cold text section

It's not worth deleting these routines even though there are no longer
in-tree consumers, but we can at least keep them out of i$ at runtime.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

mi/mibitblt.c

@@ -72,7 +72,7 @@ extern int ffs(int);
  *     set them in the destination with SetSpans
  * We let SetSpans worry about clipping to the destination.
  */
-RegionPtr
+_X_COLD RegionPtr
 miCopyArea(DrawablePtr pSrcDrawable,
            DrawablePtr pDstDrawable,
            GCPtr pGC,
@@ -261,8 +261,7 @@ miCopyArea(DrawablePtr pSrcDrawable,
  * This should be replaced with something more general.  mi shouldn't have to
  * care about such things as scanline padding et alia.
  */
-static
-MiBits *
+_X_COLD static MiBits *
 miGetPlane(DrawablePtr pDraw, int planeNum,     /* number of the bitPlane */
            int sx, int sy, int w, int h, MiBits * result)
 {
@@ -368,7 +367,7 @@ miGetPlane(DrawablePtr pDraw, int planeNum,     /* number of the bitPlane */
  * Note how the clipped out bits of the bitmap are always the background
  * color so that the stipple never causes FillRect to draw them.
  */
-static void
+_X_COLD static void
 miOpqStipDrawable(DrawablePtr pDraw, GCPtr pGC, RegionPtr prgnSrc,
                   MiBits * pbits, int srcx, int w, int h, int dstx, int dsty)
 {
@@ -510,7 +509,7 @@ miOpqStipDrawable(DrawablePtr pDraw, GCPtr pGC, RegionPtr prgnSrc,
  * build a source clip
  * Use the bitmap we've built up as a Stipple for the destination 
  */
-RegionPtr
+_X_COLD RegionPtr
 miCopyPlane(DrawablePtr pSrcDrawable,
             DrawablePtr pDstDrawable,
             GCPtr pGC,
@@ -599,7 +598,7 @@ miCopyPlane(DrawablePtr pSrcDrawable,
  * XY format:
  * get the single plane specified in planemask
  */
-void
+_X_COLD void
 miGetImage(DrawablePtr pDraw, int sx, int sy, int w, int h,
            unsigned int format, unsigned long planeMask, char *pDst)
 {
@@ -689,7 +688,7 @@ miGetImage(DrawablePtr pDraw, int sx, int sy, int w, int h,
  * ZPixmap format:
  *	This part is simple, just call SetSpans
  */
-void
+_X_COLD void
 miPutImage(DrawablePtr pDraw, GCPtr pGC, int depth,
            int x, int y, int w, int h, int leftPad, int format, char *pImage)
 {

mi/mifillrct.c

@@ -65,7 +65,7 @@ SOFTWARE.
  * then call FillSpans to fill each rectangle.  We let FillSpans worry about
  * clipping to the destination
  */
-void
+_X_COLD void
 miPolyFillRect(DrawablePtr pDrawable, GCPtr pGC, int nrectFill, /* number of rectangles to fill */
                xRectangle *prectInit    /* Pointer to first rectangle to fill */
     )