draft: arch: Add Hexagon HVX instructions

.github/workflows/main.yml

@@ -96,6 +96,8 @@ jobs:
           os: ubuntu-latest
         - tuple: loongarch64-unknown-linux-gnu
           os: ubuntu-latest
+        - tuple: hexagon-unknown-linux-musl
+          os: ubuntu-latest
         - tuple: wasm32-wasip1
           os: ubuntu-latest
 
@@ -207,6 +209,11 @@ jobs:
             tuple: amdgcn-amd-amdhsa
             os: ubuntu-latest
           norun: true
+        - target:
+            tuple: hexagon-unknown-linux-musl
+            os: ubuntu-latest
+          norun: true
+          build_std: true
 
     steps:
     - uses: actions/checkout@v4
@@ -300,7 +307,7 @@ jobs:
   # Check that the generated files agree with the checked-in versions.
   check-stdarch-gen:
     needs: [style]
-    name: Check stdarch-gen-{arm, loongarch} output
+    name: Check stdarch-gen-{arm, loongarch, hexagon} output
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
@@ -318,6 +325,10 @@ jobs:
       run: |
         cargo run --bin=stdarch-gen-loongarch --release -- crates/stdarch-gen-loongarch/lasx.spec
         git diff --exit-code
+    - name: Check hexagon
+      run: |
+        cargo run -p stdarch-gen-hexagon --release
+        git diff --exit-code
 
   conclusion:
     needs: