Allow specifying an import module using @wasm #1305.

test/test_suite/attributes/attributes_repeat_param.c3t

@@ -0,0 +1,26 @@
+// #target: macos-aarch64
+module test;
+
+def @Test(x) = { @extern("Foo" +++ x) };
+
+fn void hello_world() @Test("Megaman")
+{}
+
+fn void ello_world() @Test("Pegasus")
+{}
+
+fn int main()
+{
+	hello_world();
+	ello_world();
+	return 0;
+}
+
+/* #expect: test.ll
+
+define i32 @main() #0 {
+entry:
+  call void @FooMegaman()
+  call void @FooPegasus()
+  ret i32 0
+}

test/test_suite/attributes/wasm_import.c3t

@@ -0,0 +1,8 @@
+// #target: wasm32
+module test;
+extern fn void test() @wasm("hello", "world");
+
+/* #expect: test.ll
+
+declare void @world() #0
+attributes #0 = { nounwind uwtable "no-trapping-math"="true" "stack-protector-buffer-size"="8" "wasm-export-name"="world" "wasm-import-module"="hello" "wasm-import-name"="world" }

test/test_suite/attributes/wasm_module.c3

@@ -0,0 +1,5 @@
+
+fn void test() @wasm("hello", "world") { } // #error: Specifying a wasm import module
+extern fn void test2() @wasm("a", "b", "c"); // #error: Too many arguments to
+extern fn void test3() @extern("hello") @wasm("a"); // #error: An external name
+extern fn void test4() @extern("hello") @wasm("a", "b"); // #error: An external name