Move VerifierSupport into namespace llvm.

It currently is in an unnamed namespace and then it shouldn't be used
from something in the header file. This actually triggers a warning with
GCC:
../include/llvm/IR/Verifier.h:39:7: warning: ‘llvm::TBAAVerifier’ has a field ‘llvm::TBAAVerifier::Diagnostic’ whose type uses the anonymous namespace [enabled by default]

llvm-svn: 289942
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index 7b2b1c4..2b9dfce 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -117,7 +117,7 @@
 
 static cl::opt<bool> VerifyDebugInfo("verify-debug-info", cl::init(true));
 
-namespace {
+namespace llvm {
 
 struct VerifierSupport {
   raw_ostream *OS;
@@ -248,6 +248,10 @@
   }
 };
 
+} // namespace llvm
+
+namespace {
+
 class Verifier : public InstVisitor<Verifier>, VerifierSupport {
   friend class InstVisitor<Verifier>;