Make GCC 5.4 happy with those type casting

GCC 5.4 will report those type castings are not legal.

src/analysis/function_analysis.cpp

@@ -260,7 +260,7 @@ private:
                     assert(name->vreg == -1);
                     // skip
                 } else {
-                    RELEASE_ASSERT(0, "%d", name->lookup_type);
+                    RELEASE_ASSERT(0, "%d", static_cast<int>(name->lookup_type));
                 }
                 break;
             }

src/codegen/irgen/hooks.cpp

@@ -351,7 +351,7 @@ CompiledFunction* compileFunction(FunctionMetadata* f, FunctionSpecialization* s
             break;
         }
         default:
-            RELEASE_ASSERT(0, "%d", effort);
+            RELEASE_ASSERT(0, "%d", static_cast<int>(effort));
     }
 
     // free the bjit code if this is not a OSR compilation

src/runtime/rewrite_args.h

@@ -140,7 +140,7 @@ public:
     void assertReturnConvention(ReturnConvention required_convention) {
         assert(isSuccessful());
         ASSERT(this->out_return_convention == required_convention, "user asked for convention %d but got %d",
-               required_convention, this->out_return_convention);
+               static_cast<int>(required_convention), static_cast<int>((this->out_return_convention)));
 #ifndef NDEBUG
         return_convention_checked = true;
 #endif