[dxvk] Remap spec constant ranges

Keeping the numbers low will make debugging shaders easier.
glslang seems to have an upper limit on spec constant IDs
in place.

src/dxvk/dxvk_shader.h

@@ -21,11 +21,13 @@ namespace dxvk {
    * implementation at pipeline compilation time.
    */
   enum class DxvkSpecConstantId : uint32_t {
-    RasterizerSampleCount       = 0x10000,
-
     /// Special constant ranges that do not count
     /// towards the spec constant min/max values
-    ColorComponentMappings      = 0x20000,
+    ColorComponentMappings      = MaxNumResourceSlots,
+
+    // Specialization constants for pipeline state
+    SpecConstantRangeStart      = ColorComponentMappings + MaxNumRenderTargets * 4,
+    RasterizerSampleCount       = SpecConstantRangeStart + 0,
 
     /// Lowest and highest known spec constant IDs
     SpecConstantIdMin           = RasterizerSampleCount,