i965/fs: Don't constant propagate into integer math instructions.

Constant combining won't promote non-floats, so this isn't safe.

Fixes regressions since commit 0087cf23e.

src/mesa/drivers/dri/i965/brw_fs_combine_constants.cpp

@@ -66,8 +66,6 @@ must_promote_imm(const struct brw_device_info *devinfo, const fs_inst *inst)
 {
    switch (inst->opcode) {
    case SHADER_OPCODE_POW:
-   case SHADER_OPCODE_INT_QUOTIENT:
-   case SHADER_OPCODE_INT_REMAINDER:
       return devinfo->gen < 8;
    case BRW_OPCODE_MAD:
    case BRW_OPCODE_LRP:

src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp

@@ -499,9 +499,13 @@ fs_visitor::try_constant_propagate(fs_inst *inst, acp_entry *entry)
          progress = true;
          break;
 
-      case SHADER_OPCODE_POW:
       case SHADER_OPCODE_INT_QUOTIENT:
       case SHADER_OPCODE_INT_REMAINDER:
+         /* FINISHME: Promote non-float constants and remove this. */
+         if (devinfo->gen < 8)
+            break;
+         /* fallthrough */
+      case SHADER_OPCODE_POW:
          /* Allow constant propagation into src1 regardless of generation, and
           * let constant combining promote the constant on Gen < 8.
           */