broadcom/compiler: drop spill_count and add spilling boolean

We added spill_count to handle uniform batch spills, which we no longer do.
What we want now is a way to know if we are spilling registers.

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15041>

src/broadcom/compiler/v3d_compiler.h

@@ -789,6 +789,12 @@ struct v3d_compile {
         uint32_t spill_size;
         /* Shader-db stats */
         uint32_t spills, fills, loops;
+
+        /* Whether we are in the process of spilling registers for
+         * register allocation
+         */
+        bool spilling;
+
         /**
          * Register spilling's per-thread base address, shared between each
          * spill/fill's addressing calculations.
@@ -881,9 +887,6 @@ struct v3d_compile {
         bool emitted_tlb_load;
         bool lock_scoreboard_on_first_thrsw;
 
-        /* Total number of spilled registers in the program */
-        uint32_t spill_count;
-
         enum v3d_compilation_result compilation_result;
 
         bool tmu_dirty_rcl;