Extend the preserve_most/all calling convention description in LangRef about the
fact that the argument registers will be preserved too.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200441 91177308-0d34-0410-b5e6-96231b3b80d8
Simplify the handling of iterators in ObjectFile.

None of the object file formats reported error on iterator increment. In
retrospect, that is not too surprising: no object format stores symbols or
sections in a linked list or other structure that requires chasing pointers.
As a consequence, all error checking can be done on begin() and end().

This reduces the text segment of bin/llvm-readobj in my machine from 521233 to
518526 bytes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200442 91177308-0d34-0410-b5e6-96231b3b80d8