Subzero: Add "--verbose=status" option.

src/IceCfg.h

Index: src/IceCfg.h
diff --git a/src/IceCfg.h b/src/IceCfg.h
index 92a16809787878c0ff82fc75c77211a926f2e21e..b39673bc111b8e90b332814538d589b7f4786550 100644
--- a/src/IceCfg.h
+++ b/src/IceCfg.h
@@ -50,10 +50,15 @@ public:
   GlobalContext *getContext() const { return Ctx; }
   uint32_t getSequenceNumber() const { return SequenceNumber; }
 
+  static constexpr VerboseMask defaultVerboseMask() {
+    return IceV_All & ~IceV_Status;
+  }
   /// Returns true if any of the specified options in the verbose mask are set.
   /// If the argument is omitted, it checks if any verbose options at all are
   /// set.
-  bool isVerbose(VerboseMask Mask = IceV_All) const { return VMask & Mask; }
+  bool isVerbose(VerboseMask Mask = defaultVerboseMask()) const {
+    return VMask & Mask;
+  }
   void setVerbose(VerboseMask Mask) { VMask = Mask; }
 
   /// \name Manage the name and return type of the function being translated.