Allow bitwise-or aside from type annotations in asm->wasm conversion.

BUG= https://code.google.com/p/v8/issues/detail?id=4203
TEST=mjsunit/asm-wasm
R=aseemgarg@chromium.org,titzer@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1720773002

Cr-Commit-Position: refs/heads/master@{#34185}

src/wasm/asm-wasm-builder.cc

@@ -874,7 +874,6 @@ class AsmWasmBuilderImpl : public AstVisitor {
         (TypeOf(expr->left()) == kAstI32)) {
       return kAsIs;
     } else {
-      UNREACHABLE();
       return kNone;
     }
   }

test/mjsunit/wasm/asm-wasm.js

@@ -1265,3 +1265,51 @@ TestForeignVariables();
   assertEquals(123, m.ifunc(456.7, 123));
   assertEquals(123.4, m.dfunc(456, 123.4));
 })();
+
+
+(function TestOr() {
+  function Module() {
+    "use asm";
+    function func() {
+      var x = 1;
+      var y = 2;
+      return (x | y) | 0;
+    }
+    return {func: func};
+  }
+
+  var m = _WASMEXP_.instantiateModuleFromAsm(Module.toString());
+  assertEquals(3, m.func());
+})();
+
+
+(function TestAnd() {
+  function Module() {
+    "use asm";
+    function func() {
+      var x = 3;
+      var y = 2;
+      return (x & y) | 0;
+    }
+    return {func: func};
+  }
+
+  var m = _WASMEXP_.instantiateModuleFromAsm(Module.toString());
+  assertEquals(2, m.func());
+})();
+
+
+(function TestXor() {
+  function Module() {
+    "use asm";
+    function func() {
+      var x = 3;
+      var y = 2;
+      return (x ^ y) | 0;
+    }
+    return {func: func};
+  }
+
+  var m = _WASMEXP_.instantiateModuleFromAsm(Module.toString());
+  assertEquals(1, m.func());
+})();