Index: lib/CodeGen/BlockGenerators.cpp
===================================================================
--- lib/CodeGen/BlockGenerators.cpp
+++ lib/CodeGen/BlockGenerators.cpp
@@ -234,6 +234,14 @@
     NewInst->replaceUsesOfWith(OldOperand, NewOperand);
   }
 
+  // When copying the instruction onto the Module meant for the GPU,
+  // debug metadata attached to an instruction causes all related 
+  // metadata to be pulled into the Module. This includes the DICompileUnit,
+  // which will not be listed in llvm.dbg.cu of the Module since the Module
+  // doesn't contain one. This fails the verification of the Module and the
+  // subsequent generation of the ASM string.
+  NewInst->setDebugLoc(llvm::DebugLoc());
+
   Builder.Insert(NewInst);
   BBMap[Inst] = NewInst;