Merge pull request #523 from takikawa/link-error

[js-api] Throw consistent exns in "read the imports"

document/js-api/index.bs

@@ -371,7 +371,7 @@ A {{Module}} object represents a single WebAssembly module. Each {{Module}} obje
                     1. Throw a {{LinkError}} exception.
                 1. If |valtype| is [=v128=],
                     1. Throw a {{LinkError}} exception.
-                1. Let |value| be [=ToWebAssemblyValue=](|v|, |valtype|).
+                1. Let |value| be [=ToWebAssemblyValue=](|v|, |valtype|). If this operation throws a {{TypeError}}, catch it, and throw a {{LinkError}} exception.
                 1. Let |store| be the [=surrounding agent=]'s [=associated store=].
                 1. Let (|store|, |globaladdr|) be [=global_alloc=](|store|, [=const=] |valtype|, |value|).
                 1. Set the [=surrounding agent=]'s [=associated store=] to |store|.