BaseTools/GenFw RVCT: fix relocation processing of PT_DYNAMIC sections

Unlike GNU ld, which can be instructed to emit symbol based static
relocations into fully linked binaries using the --emit-relocs command
line switch, the RVCT armlink tool can only emit dynamic relocations
into the PT_DYNAMIC segment.

This has two consequences
. we can only identify absolute relocations, so there is no way to fix
  up relative relocations between sections, or check their validity in
  the PE/COFF layout
. the r_offset fields of the PT_DYNAMIC DT_REL entries are relative
  either to the base of the image or to any of its segments but *not* to
  the base of the input section that contains the location they refer
  to, and converting them to PE/COFF image offsets is non-trivial unless
  the sections are laid out in the same way in the ELF and PE/COFF
  versions of the binary.

There is really only one way to deal with this, and that is to require
that the ELF and PE/COFF versions of the binary are identical in memory.
So enforce that in the code.

Also, fix the utterly broken relocation fixup code that dereferences
ELF32_R_SYM(r_info) both as a 1-based program header index and a 0-based
section header index. If this code ever produced working binaries, it
was purely by chance.

(Sync patch r19236 from main trunk.)

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/branches/UDK2015@19383 6f19259b-4bc3-4df7-8a09-765794883524

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