[naga] Ensure wgsl snapshot code is reachable from an entry point (gfx-rs#7674)

Author: andyleiserson

naga/tests/in/wgsl/6220-break-from-loop.wgsl

@@ -41,3 +41,8 @@ fn break_from_loop() {
       break;
     }
 }
+
+@compute @workgroup_size(1)
+fn main() {
+    break_from_loop();
+}

naga/tests/in/wgsl/7048-multiple-dynamic-1.wgsl

@@ -1,3 +1,4 @@
+@compute @workgroup_size(1)
 fn f() {
     let b = array<vec3f, 2>();
     var poly = vec4f(0);

naga/tests/in/wgsl/7048-multiple-dynamic-3.wgsl

@@ -14,3 +14,9 @@ fn foobar(normals: array<vec3f, 12>, count: u32) -> QEFResult {
 
         return QEFResult(0.0, vec3(0.0));
 }
+
+@fragment
+fn main() {
+    var arr: array<vec3f, 12>;
+    foobar(arr, 1);
+}

naga/tests/in/wgsl/abstract-types-atomic.wgsl

@@ -32,3 +32,9 @@ fn test_atomic_u32() {
   _ = atomicMax(&atomic_u32, 1);
   _ = atomicExchange(&atomic_u32, 1);
 }
+
+@compute @workgroup_size(1)
+fn main() {
+    test_atomic_i32();
+    test_atomic_u32();
+}

naga/tests/in/wgsl/abstract-types-builtins.wgsl

@@ -1,3 +1,4 @@
+@compute @workgroup_size(1)
 fn f() {
   // For calls that return abstract types, we can't write the type we
   // actually expect, but we can at least require an automatic

naga/tests/in/wgsl/abstract-types-function-calls.wgsl

@@ -22,6 +22,7 @@ const const_mat_af = mat2x2(vec2(0.0), vec2(0.0));
 const const_arr_af = array(0.0, 0.0);
 const const_arr_ai = array(0, 0);
 
+@compute @workgroup_size(1)
 fn main() {
     func_f(0.0);
     func_f(0);

naga/tests/in/wgsl/abstract-types-let.wgsl

@@ -113,3 +113,9 @@ fn mixed_constant_and_runtime_arguments() {
     let xvusu: vec2<u32> = vec2(u);
     let xvfsf: vec2<f32> = vec2(f);
 }
+
+@compute @workgroup_size(1)
+fn main() {
+    all_constant_arguments();
+    mixed_constant_and_runtime_arguments();
+}

naga/tests/in/wgsl/abstract-types-operators.wgsl

@@ -84,3 +84,10 @@ fn wgpu_4435() {
     let x = 1;
     let y = a[x-1];
 }
+
+@compute @workgroup_size(1)
+fn main() {
+    runtime_values();
+    wgpu_4445();
+    wgpu_4435();
+}

naga/tests/in/wgsl/abstract-types-return.wgsl

@@ -1,6 +1,3 @@
-@compute @workgroup_size(1)
-fn main() {}
-
 fn return_i32_ai() -> i32 {
     return 1;
 }
@@ -34,3 +31,15 @@ fn return_vec2f32_const_ai() -> vec2<f32> {
     const vec_one = vec2(1);
     return vec_one;
 }
+
+@compute @workgroup_size(1)
+fn main() {
+    return_i32_ai();
+    return_u32_ai();
+    return_f32_ai();
+    return_f32_af();
+    return_vec2f32_ai();
+    return_arrf32_ai();
+    return_const_f32_const_ai();
+    return_vec2f32_const_ai();
+}

naga/tests/in/wgsl/abstract-types-texture.wgsl

@@ -24,3 +24,10 @@ fn depth() {
 fn storage() {
   textureStore(st, vec2(0,1), vec4(2,3,4,5));
 }
+
+@fragment
+fn main() {
+    color();
+    depth();
+    storage();
+}