[NFC] Fixed -Wdocumentation warning
[NFC] Fixed -Wdocumentation warning

/srv/llvm-buildbot-srcatch/llvm-build-dir/clang-x86_64-debian-fast/llvm.src/lib/Target/AMDGPU/AMDGPUGenRegisterBankInfo.def:98:1: warning: not a Doxygen trailing comment [-Wdocumentation]
1 warning generated.



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@370596 91177308-0d34-0410-b5e6-96231b3b80d8

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