Change of UserLabelPrefix default value from "_" to ""

Differential Revision: http://reviews.llvm.org/D16295

llvm-svn: 258504
diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
index 1648a27..6a67f41 100644
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -72,7 +72,7 @@
   DoubleFormat = &llvm::APFloat::IEEEdouble;
   LongDoubleFormat = &llvm::APFloat::IEEEdouble;
   DataLayoutString = nullptr;
-  UserLabelPrefix = "_";
+  UserLabelPrefix = "";
   MCountName = "mcount";
   RegParmMax = 0;
   SSERegParmMax = 0;