[ignition] Decrease code size multiplier to 24.

BUG=

Review-Url: https://codereview.chromium.org/2758503002
Cr-Commit-Position: refs/heads/master@{#43861}

src/interpreter/interpreter.h

@@ -67,7 +67,7 @@ class Interpreter {
   }
 
   // TODO(ignition): Tune code size multiplier.
-  static const int kCodeSizeMultiplier = 32;
+  static const int kCodeSizeMultiplier = 24;
 
  private:
 // Bytecode handler generator functions.