[wasm][asm2wasm] Fixes a bug in 8-bit heap view accesses.

src/asmjs/asm-typer.cc

Index: src/asmjs/asm-typer.cc
diff --git a/src/asmjs/asm-typer.cc b/src/asmjs/asm-typer.cc
index 0b98775190488ed4414c61d2698b074cbc68eb97..80f296052f16279531c4b42b67820cd3e12241db 100644
--- a/src/asmjs/asm-typer.cc
+++ b/src/asmjs/asm-typer.cc
@@ -2462,9 +2462,7 @@ AsmType* AsmTyper::ValidateHeapAccess(Property* heap,
         }
         return obj_type->StoreType();
       }
-      // TODO(jpp): it may be the case that, if type is not an Intish, we could
-      // fail here instead of letting the validator try using the "leniency"
-      // rule (i.e., allow unshifted indexes for heap views of 8-bit integers.
+      FAIL(key_as_binop, "Invalid heap access index.");
     }
   }