Fixed/added namespace ending comments using clang-tidy. NFC

The patch is generated using this command:

tools/clang/tools/extra/clang-tidy/tool/run-clang-tidy.py -fix \
  -checks=-*,llvm-namespace-comment -header-filter='llvm/.*|clang/.*' \
  llvm/lib/


Thanks to Eugene Kosov for the original patch!

llvm-svn: 240137
diff --git a/llvm/lib/IR/LegacyPassManager.cpp b/llvm/lib/IR/LegacyPassManager.cpp
index 27d98a2..881d780 100644
--- a/llvm/lib/IR/LegacyPassManager.cpp
+++ b/llvm/lib/IR/LegacyPassManager.cpp
@@ -275,8 +275,8 @@
 void FunctionPassManagerImpl::anchor() {}
 
 char FunctionPassManagerImpl::ID = 0;
-} // End of legacy namespace
-} // End of llvm namespace
+} // namespace legacy
+} // namespace llvm
 
 namespace {
 //===----------------------------------------------------------------------===//
@@ -439,8 +439,8 @@
 void PassManagerImpl::anchor() {}
 
 char PassManagerImpl::ID = 0;
-} // End of legacy namespace
-} // End of llvm namespace
+} // namespace legacy
+} // namespace llvm
 
 namespace {
 
@@ -486,7 +486,7 @@
   }
 };
 
-} // End of anon namespace
+} // namespace
 
 static TimingInfo *TheTimeInfo;