[PATCH vkd3d 3/5] vkd3d-shader: Use the HLSL string buffer cache in hlsl_type_to_string() and hlsl_modifiers_to_string().

[Matteo Bruni]

With the subject changed to "vkd3d-shader: Use the HLSL string buffer
cache in debug_hlsl_type() and dump_ir_var()." (or something to that
effect) this is:

Signed-off-by: Matteo Bruni <mbruni at codeweavers.com>