i965/fs: Remove is_valid_3src().

Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>

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

@@ -622,12 +622,6 @@ fs_reg::is_contiguous() const
    return stride == 1;
 }
 
-bool
-fs_reg::is_valid_3src() const
-{
-   return file == GRF || file == UNIFORM;
-}
-
 int
 fs_visitor::type_size(const struct glsl_type *type)
 {

src/mesa/drivers/dri/i965/brw_fs.h

@@ -83,7 +83,6 @@ public:
    fs_reg(fs_visitor *v, const struct glsl_type *type);
 
    bool equals(const fs_reg &r) const;
-   bool is_valid_3src() const;
    bool is_contiguous() const;
 
    /** Smear a channel of the reg to all channels. */

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

@@ -514,7 +514,7 @@ fs_visitor::visit(ir_expression *ir)
 	 ir->operands[operand]->fprint(stderr);
          fprintf(stderr, "\n");
       }
-      assert(this->result.is_valid_3src());
+      assert(this->result.file == GRF || this->result.file == UNIFORM);
       op[operand] = this->result;
 
       /* Matrix expression operands should have been broken down to vector