Subzero: Change -asm-verbose output to print more useful info.

src/IceOperand.h

Index: src/IceOperand.h
diff --git a/src/IceOperand.h b/src/IceOperand.h
index f624641f17725ea6b0b342b1d695572e6cf339c2..28c118d23c1966df4555a59a6a5e3621f2eee0ff 100644
--- a/src/IceOperand.h
+++ b/src/IceOperand.h
@@ -442,6 +442,11 @@ public:
 
   int32_t getStackOffset() const { return StackOffset; }
   void setStackOffset(int32_t Offset) { StackOffset = Offset; }
+  /// Returns the variable's stack offset in symbolic form, to improve
+  /// readability in DecorateAsm mode.
+  IceString getSymbolicStackOffset(const Cfg *Func) const {
+    return "lv$" + getName(Func);
+  }
 
   static const int32_t NoRegister = -1;
   bool hasReg() const { return getRegNum() != NoRegister; }