[roll] Roll fuchsia [elfldltl] Refactor segment-loading in VmarLoader This separates much-simpler read-only case from the others, using just a trivial Map wrapper for that trivial case. MapFileData is replaced with MapWritable, which handles only the writable (COW clone creation) case. Both it and MapZeroFill use constant flags for R/W page permissions, which are always what writable segments use. Error messages for mapping failures include the address or file offset, which can be matched up with PT_LOAD details to see exactly which segment failed to load. Original-Bug: 91206 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/785766 Original-Revision: e831cc4a837bdebf229d1bc973f5d8fa24c82b39 GitOrigin-RevId: 9e3439ca04e17026033390b5c9b84df1310a015e Change-Id: I165c6ae58291f0658ef03f3017d0db820c988157
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