Don't rely upon the MCSymbol "isDefined" method to indicate if a label has been
emitted or not. The JIT doesn't set that. Look it up in the label location table
instead.

llvm-svn: 101686
diff --git a/llvm/lib/ExecutionEngine/JIT/JITDwarfEmitter.cpp b/llvm/lib/ExecutionEngine/JIT/JITDwarfEmitter.cpp
index 281ec73..4b3ca87 100644
--- a/llvm/lib/ExecutionEngine/JIT/JITDwarfEmitter.cpp
+++ b/llvm/lib/ExecutionEngine/JIT/JITDwarfEmitter.cpp
@@ -75,7 +75,7 @@
     MCSymbol *Label = Move.getLabel();
     
     // Throw out move if the label is invalid.
-    if (Label && !Label->isDefined())
+    if (Label && (*JCE->getLabelLocations())[Label] == 0)
       continue;
     
     intptr_t LabelPtr = 0;
@@ -711,7 +711,7 @@
     MCSymbol *Label = Move.getLabel();
     
     // Throw out move if the label is invalid.
-    if (Label && !Label->isDefined())
+    if (Label && (*JCE->getLabelLocations())[Label] == 0)
       continue;
     
     intptr_t LabelPtr = 0;