Wherein the TargetInfo argument to Preprocessor is made 'const' and propogated.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@87087 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGStmt.cpp b/lib/CodeGen/CGStmt.cpp
index b47930e..b6d7b39 100644
--- a/lib/CodeGen/CGStmt.cpp
+++ b/lib/CodeGen/CGStmt.cpp
@@ -737,7 +737,7 @@
 }
 
 static std::string
-SimplifyConstraint(const char *Constraint, TargetInfo &Target,
+SimplifyConstraint(const char *Constraint, const TargetInfo &Target,
                  llvm::SmallVectorImpl<TargetInfo::ConstraintInfo> *OutCons=0) {
   std::string Result;