Do not force asm's to be chained if they don't touch

memory and aren't volatile.  This was interfering with
good scheduling.

llvm-svn: 69008

lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp

@@ -5439,6 +5439,9 @@ void SelectionDAGLowering::visitInlineAsm(CallSite CS) {
     }
 
     setValue(CS.getInstruction(), Val);
+    // Don't need to use this as a chain in this case.
+    if (!IA->hasSideEffects() && !hasMemory && IndirectStoresToEmit.empty())
+      return;
   }
 
   std::vector<std::pair<SDValue, Value*> > StoresToEmit;