* ldlang.c (lang_get_regions): Add extra parameter 'have_vma' which if true will

* ldlang.c (lang_get_regions): Add extra parameter 'have_vma' which if true will
  prevent the LMA region being used as a replacement for a default VMA region.
  (lang_leave_output_section_statement): Pass extra parameter.
  (lang_leave_overlay): Likewise.
* ld.texinfo (Output Section LMA): Document that the LMA region can be set to
  the VMA region if no VMA has been set.
* ldlang.h (struct lang_output_section_phdr_list): Create a typedef for this
  type.  Minor formatting fixes.