Vulkan: Inline small data conversion function

In a profile of sculpting with the Vulkan GPU backend enabled,
This function made up 0.7% of samples. Since it's just a single
comparison, inlining it should be helpful for the compiler.

Pull Request: https://projects.blender.org/blender/blender/pulls/138210

source/blender/gpu/vulkan/vk_data_conversion.cc

@@ -1278,11 +1278,6 @@ void VertexFormatConverter::reset()
   needs_conversion_ = false;
 }
 
-bool VertexFormatConverter::is_initialized() const
-{
-  return device_format_ != nullptr;
-}
-
 void VertexFormatConverter::init(const GPUVertFormat *vertex_format,
                                  const VKWorkarounds &workarounds)
 {

source/blender/gpu/vulkan/vk_data_conversion.hh

@@ -194,6 +194,11 @@ struct VertexFormatConverter {
                          const GPUVertAttr &source_attribute) const;
 };
 
+inline bool VertexFormatConverter::is_initialized() const
+{
+  return device_format_ != nullptr;
+}
+
 /* \} */
 
 /* -------------------------------------------------------------------- */