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/AArch64/AArch64PBQPRegAlloc.h b/llvm/lib/Target/AArch64/AArch64PBQPRegAlloc.h
index c83aea4..4f656f9 100644
--- a/llvm/lib/Target/AArch64/AArch64PBQPRegAlloc.h
+++ b/llvm/lib/Target/AArch64/AArch64PBQPRegAlloc.h
@@ -33,6 +33,6 @@
   // Add constraints between existing chains
   void addInterChainConstraint(PBQPRAGraph &G, unsigned Rd, unsigned Ra);
 };
-} // namespace llvm
+}
 
 #endif // LLVM_LIB_TARGET_AARCH64_AARCH64PBQPREGALOC_H