[wasm] [asmjs] Route asm.js warnings to the dev console.

src/messages.h

Index: src/messages.h
diff --git a/src/messages.h b/src/messages.h
index 86cc8d0dff3e44100dc0e953b1ca51d7b3180464..74645bb84f3eafc1d6261ea202e325cbdeda5c2a 100644
--- a/src/messages.h
+++ b/src/messages.h
@@ -652,6 +652,8 @@ class ErrorUtils : public AllStatic {
   T(WasmTrapFuncSigMismatch, "function signature mismatch")                    \
   T(WasmTrapInvalidIndex, "invalid index into function table")                 \
   T(WasmTrapTypeError, "invalid type")                                         \
+  /* Asm.js validation warnings */                                             \
+  T(AsmJsInvalid, "Invalid asm.js: %")                                         \
   /* DataCloneError messages */                                                \
   T(DataCloneError, "% could not be cloned.")                                  \
   T(DataCloneErrorNeuteredArrayBuffer,                                         \