Update shader bencher to share some logic with snapshots

Cargo.toml

@@ -10,6 +10,7 @@ members = [
     "examples/standalone/*",
     "lock-analyzer",
     "naga-cli",
+    "naga-test",
     "naga",
     "naga/fuzz",
     "naga/hlsl-snapshots",
@@ -32,6 +33,7 @@ default-members = [
     "examples/standalone/*",
     "lock-analyzer",
     "naga-cli",
+    "naga-test",
     "naga",
     "naga/fuzz",
     "naga/hlsl-snapshots",
@@ -64,6 +66,7 @@ authors = ["gfx-rs developers"]
 
 [workspace.dependencies]
 naga = { version = "26.0.0", path = "./naga" }
+naga-test = { version = "26.0.0", path = "./naga-test" }
 wgpu = { version = "26.0.0", path = "./wgpu", default-features = false, features = [
     "serde",
     "wgsl",

benches/Cargo.toml

@@ -41,6 +41,7 @@ naga = { workspace = true, features = [
     "glsl-out",
     "wgsl-out",
 ] }
+naga-test = { workspace = true, features = [] }
 nanorand.workspace = true
 pollster.workspace = true
 profiling.workspace = true