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/Target/AMDGPU/R600TextureIntrinsicsReplacer.cpp b/llvm/lib/Target/AMDGPU/R600TextureIntrinsicsReplacer.cpp
index 2fc7b02..93bcf68 100644
--- a/llvm/lib/Target/AMDGPU/R600TextureIntrinsicsReplacer.cpp
+++ b/llvm/lib/Target/AMDGPU/R600TextureIntrinsicsReplacer.cpp
@@ -296,7 +296,7 @@
 
 char R600TextureIntrinsicsReplacer::ID = 0;
 
-}
+} // namespace
 
 FunctionPass *llvm::createR600TextureIntrinsicsReplacer() {
   return new R600TextureIntrinsicsReplacer();