[gvn] Fix more indenting and formatting in regions of code that will need to be changed for porting to the new pass manager.
[gvn] Fix more indenting and formatting in regions of code that will
need to be changed for porting to the new pass manager.

Also sink the comment on the ValueTable class back to that class instead
of it dangling on an anonymous namespace.

No functionality changed.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@263084 91177308-0d34-0410-b5e6-96231b3b80d8

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