Do not translate functions from units marked as interpret-only.

Summary: create_function calls setInterpretOnly() but still goes to JIT in enterVM*
functions. This patch adds a check to avoid translating interpret-only functions
in shouldTranslateNoSizeLimit().

Fix #5399.
Closes #5453

Reviewed By: @jwatzman

Differential Revision: D2131171

hphp/runtime/vm/jit/mc-generator.cpp

@@ -341,6 +341,11 @@ bool MCGenerator::shouldTranslateNoSizeLimit(const Func* func) const {
     return false;
   }
 
+  // Do not translate functions from units marked as interpret-only.
+  if (func->unit()->isInterpretOnly()) {
+    return false;
+  }
+
   /*
    * We don't support JIT compiling functions that use some super-dynamic php
    * variables.