Merge pull request asm-js#96 from soliton4/ifTypeIssue

if type check issue

Author: sunfishcode

lib/validate.js

@@ -718,7 +718,7 @@ Vp.checkArguments = function checkArguments(ts, expected, msg, locs, loc) {
 
 // (Expression, Statement, Statement | null) -> void
 Vp.ifStatement = function ifStatement(test, cons, alt) {
-    this.checkSubtype(this.expression(test), types.boolish, "if test", test.loc);
+    this.checkSubtype(this.expression(test), ty.Int, "if test", test.loc);
     this.statement(cons);
     if (alt)
         this.statement(alt);