Put all LLVM code into the llvm namespace, as per bug 109.

llvm-svn: 9903
diff --git a/llvm/lib/Analysis/Expressions.cpp b/llvm/lib/Analysis/Expressions.cpp
index 4d8897e..b316390 100644
--- a/llvm/lib/Analysis/Expressions.cpp
+++ b/llvm/lib/Analysis/Expressions.cpp
@@ -18,6 +18,8 @@
 #include "llvm/ConstantHandling.h"
 #include "llvm/Function.h"
 
+namespace llvm {
+
 ExprType::ExprType(Value *Val) {
   if (Val) 
     if (ConstantInt *CPI = dyn_cast<ConstantInt>(Val)) {
@@ -352,3 +354,5 @@
   // Otherwise, I don't know anything about this value!
   return I;
 }
+
+} // End llvm namespace