Merge #799

799: Derive Hash on BindGroupLayoutEntry r=kvark a=kunalmohan

**Connections**
_Link to the issues addressed by this PR, or dependent PRs in other repositories_

**Description**
_Describe what problem this is solving, and how it's solved._
Required in Servo.

**Testing**
_Explain how this change is tested._
Not tested.
<!--
Non-trivial functional changes would need to be tested through:
  - [wgpu-rs](https://github.com/gfx-rs/wgpu-rs) - test the examples.
  - [wgpu-native](https://github.com/gfx-rs/wgpu-native/) - check the generated C header for sanity.

Ideally, a PR needs to link to the draft PRs in these projects with relevant modifications.
See https://github.com/gfx-rs/wgpu/pull/666 for an example.
If you can add a unit/integration test here in `wgpu`, that would be best.
-->


Co-authored-by: Kunal Mohan <kunalmohan99@gmail.com>

wgpu-types/src/lib.rs

@@ -1664,7 +1664,7 @@ pub struct TextureDataLayout {
 /// Specific type of a binding.
 ///
 /// WebGPU spec: https://gpuweb.github.io/gpuweb/#dictdef-gpubindgrouplayoutentry
-#[derive(Clone, Debug, Eq, PartialEq)]
+#[derive(Clone, Debug, Eq, PartialEq, Hash)]
 #[cfg_attr(feature = "trace", derive(Serialize))]
 #[cfg_attr(feature = "replay", derive(Deserialize))]
 pub enum BindingType {
@@ -1769,7 +1769,7 @@ pub enum BindingType {
 }
 
 /// Describes a single binding inside a bind group.
-#[derive(Clone, Debug, PartialEq, Eq)]
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "trace", derive(Serialize))]
 #[cfg_attr(feature = "replay", derive(Deserialize))]
 pub struct BindGroupLayoutEntry {