Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC)

Apparently, the style needs to be agreed upon first.

llvm-svn: 240390
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 1cdfb41..2600ee5 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -3765,7 +3765,7 @@
   TailCallArgumentInfo() : FrameIdx(0) {}
 };
 
-} // namespace
+}
 
 /// StoreTailCallArgumentsToStackSlot - Stores arguments to their stack slot.
 static void