Re: MR6v2 - Avoid performance degradation due to vDSO unmapping (BZ#52313)

[Jinoh Kang (＠iamahuman)]

I have cleaned up the code a bit.  Also, I clarified the rationale in d45761a20b471b3ccb64df5fe7509d4cce753a92 (loader: Don't clobber existing memory mappings when reserving addresses.).