glsl: Make is_16bit_constant from i965 an ir_constant method.

The i965 MUL instruction doesn't natively support 32-bit by 32-bit
integer multiplication; additional instructions (MACH/MOV) are required.
However, we can avoid those if we know one of the operands can be
represented in 16 bits or less.  The vector backend's is_16bit_constant
static helper function checks for this.

We want to be able to use it in the scalar backend as well, which means
moving the function to a more generally-usable location.  Since it isn't
i965 specific, I decided to make it an ir_constant method, in case it
ends up being useful to other people as well.

v2: Rename from is_16bit_integer_constant to is_uint16_constant, as
    suggested by Ilia Mirkin.  Update comments to clarify that it does
    apply to both int and uint types, as long as the value is
    non-negative and fits in 16-bits.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>

src/glsl/ir.cpp

@@ -1223,6 +1223,15 @@ ir_constant::is_basis() const
    return ones == 1;
 }
 
+bool
+ir_constant::is_uint16_constant() const
+{
+   if (!type->is_integer())
+      return false;
+
+   return value.u[0] < (1 << 16);
+}
+
 ir_loop::ir_loop()
 {
    this->ir_type = ir_type_loop;