Rename getAnalysisToUpdate to getAnalysisIfAvailable.

llvm-svn: 63198
diff --git a/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp b/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
index 5cf2ffd..794f772 100644
--- a/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
+++ b/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
@@ -379,7 +379,7 @@
   MRI = &MF.getRegInfo();
   TII = TM.getInstrInfo();
   TRI = TM.getRegisterInfo();
-  LV = getAnalysisToUpdate<LiveVariables>();
+  LV = getAnalysisIfAvailable<LiveVariables>();
 
   bool MadeChange = false;