[PowerPC][NFC] Move comment to the relevant function
[PowerPC][NFC] Move comment to the relevant function

A comment that applies to a virtual destructor was placed on a class
constructor. Move the comment to where it belongs.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@364132 91177308-0d34-0410-b5e6-96231b3b80d8

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