DebugInfo: Gut DIExpression

Completely gut `DIExpression`, turning it into a simple wrapper around
`MDExpression *`.  There are two bits of magic left:

  - It's constructed from `const MDExpression*` but convertible to
    `MDExpression*`.
  - It's default-constructed to `nullptr`.

Otherwise, it should behave quite like a raw pointer.  Once I've done
the same to the rest of the `DIDescriptor` subclasses, I'll come back to
delete them entirely (and update call sites as necessary to deal with
the missing magic).

llvm-svn: 234832

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
index ee7a8239ff0..74ff4db3bd6 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -123,9 +123,9 @@ public:
       FrameIndex.append(FI.begin(), FI.end());
     }
     assert(Expr.size() > 1
-           ? std::all_of(Expr.begin(), Expr.end(),
-                         [](DIExpression &E) { return E.isBitPiece(); })
-           : (true && "conflicting locations for variable"));
+               ? std::all_of(Expr.begin(), Expr.end(),
+                             [](DIExpression &E) { return E->isBitPiece(); })
+               : (true && "conflicting locations for variable"));
   }
 
   // Translate tag to proper Dwarf tag.
@@ -156,7 +156,7 @@ public:
     assert(Var && "Invalid complex DbgVariable!");
     assert(Expr.size() == 1 &&
            "variableHasComplexAddress() invoked on multi-FI variable");
-    return Expr.back().getNumElements() > 0;
+    return Expr.back()->getNumElements() > 0;
   }
   bool isBlockByrefVariable() const;
   DIType getType() const;