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Improve the handling of missing elf symtab and missing symbol sizes

Description

Improve the handling of missing elf symtab and missing symbol sizes

  • Generate artificial symbol names from eh_fame during symbol parsing so these symbols are already present when we calcualte the size of the symbols where 0 is specified.
  • Fix symbol size calculation for the last symbol in the file where it have to last until the end of the parent section.

Differential revision: http://reviews.llvm.org/D16996