Fix wasm tests

Author: calebzulawski

crates/std_float/Cargo.toml

@@ -11,6 +11,10 @@ core_simd = { path = "../core_simd", default-features = false }
 [dev-dependencies.test_helpers]
 path = "../test_helpers"
 
+[target.'cfg(target_arch = "wasm32")'.dev-dependencies]
+wasm-bindgen = "0.2"
+wasm-bindgen-test = "0.3"
+
 [features]
 default = ["as_crate"]
 as_crate = []