r300g: remove always_dirty flag and correct leftovers

src/gallium/drivers/r300/r300_context.h

     unsigned size;
     /* Whether this atom should be emitted. */
     boolean dirty;
-    /* Another dirty flag that is never automatically cleared. */
-    boolean always_dirty;
 };
 
 struct r300_blend_state {

src/gallium/drivers/r300/r300_emit.c

     if (count == 0)
         return;
 
-    BEGIN_CS(count * 5);
+    BEGIN_CS(size);
     for(i = first; i < end; ++i) {
         if (constants->Constants[i].Type == RC_CONSTANT_STATE) {
             const float *data = get_shader_constant(r300,
     if (count == 0)
         return;
 
-    BEGIN_CS(count * 4 + 3);
+    BEGIN_CS(size);
     OUT_CS_REG(R500_GA_US_VECTOR_INDEX, R500_GA_US_VECTOR_INDEX_TYPE_CONST);
     OUT_CS_ONE_REG(R500_GA_US_VECTOR_DATA, count * 4);
     for(i = 0; i < count; ++i) {
     if (count == 0)
         return;
 
-    BEGIN_CS(count * 7);
+    BEGIN_CS(size);
     for(i = first; i < end; ++i) {
         if (constants->Constants[i].Type == RC_CONSTANT_STATE) {
             const float *data = get_shader_constant(r300,
     unsigned dwords = 0;
 
     foreach(atom, &r300->atom_list) {
-        if (atom->dirty || atom->always_dirty) {
+        if (atom->dirty) {
             dwords += atom->size;
         }
     }
     struct r300_atom* atom;
 
     foreach(atom, &r300->atom_list) {
-        if (atom->dirty || atom->always_dirty) {
+        if (atom->dirty) {
             atom->emit(r300, atom->size, atom->state);
             atom->dirty = FALSE;
         }