Updating function comments; no functional changes intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188554 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Allocate memoperand in the MachienFunction so it doesn't leak.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188555 91177308-0d34-0410-b5e6-96231b3b80d8