add scaffolding for target-specific MCExprs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95559 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCMachOStreamer.cpp b/lib/MC/MCMachOStreamer.cpp
index 981eb72..40a21ad 100644
--- a/lib/MC/MCMachOStreamer.cpp
+++ b/lib/MC/MCMachOStreamer.cpp
@@ -87,6 +87,7 @@
 
   const MCExpr *AddValueSymbols(const MCExpr *Value) {
     switch (Value->getKind()) {
+    case MCExpr::Target: assert(0 && "Can't handle target exprs yet!");
     case MCExpr::Constant:
       break;