testsuite: Add wasm32 to testsuite arches with NCG

The compiler --info reports that wasm32 compilers have a NCG, so we
should agree with that here.

hadrian/src/Settings/Builders/RunTest.hs

@@ -118,7 +118,7 @@ inTreeCompilerArgs stg = do
 
     os          <- queryHostTarget queryOS
     arch        <- queryTargetTarget queryArch
-    let codegen_arches = ["x86_64", "i386", "powerpc", "powerpc64", "powerpc64le", "aarch64"]
+    let codegen_arches = ["x86_64", "i386", "powerpc", "powerpc64", "powerpc64le", "aarch64", "wasm32"]
     let withNativeCodeGen
           | unregisterised = False
           | arch `elem` codegen_arches = True