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

llvm-svn: 9903
diff --git a/llvm/lib/Target/X86/PeepholeOptimizer.cpp b/llvm/lib/Target/X86/PeepholeOptimizer.cpp
index fbc84f7..2f3280a 100644
--- a/llvm/lib/Target/X86/PeepholeOptimizer.cpp
+++ b/llvm/lib/Target/X86/PeepholeOptimizer.cpp
@@ -15,6 +15,8 @@
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 
+namespace llvm {
+
 namespace {
   struct PH : public MachineFunctionPass {
     virtual bool runOnMachineFunction(MachineFunction &MF);
@@ -131,3 +133,5 @@
     return false;
   }
 }
+
+} // End llvm namespace