[AArch64][v8.1a] The "pan" sysreg isn't MSR-specific. NFCI.
[AArch64][v8.1a] The "pan" sysreg isn't MSR-specific. NFCI.

It's already in SysRegMappings, no need to also have it in MSRMappings:
the latter is only used if we didn't find a match in the former.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@243933 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm