[Utils] remove duplicated documentation comments; NFC
[Utils] remove duplicated documentation comments; NFC

http://llvm.org/docs/CodingStandards.html#doxygen-use-in-documentation-comments

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@367015 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm