fix broken Xtensa bfd code for generating .got.loc sections

[Bob Wilson]

My previous changes to add the Xtensa-specific .got.loc section for dynamic 
links missed a case where some of the Xtensa literal tables are discarded.  
This patch fixes that by changing the discard_info_for_section function to 
adjust the size of .got.loc when it removes literal table entries.  Without 
this patch, the linker fails without printing any error message, so the patch 
also adds an error message in case similar failures occur in the future.  It 
also fixes a comment typo and some unrelated issues with error messages.  I 
tested this by building cross-binutils, cross-gcc and glibc for an 
xtensa-linux target.  The glibc build didn't completely finish but it failed 
for unrelated reasons and got further than it ever has before with recent 
tools.  Committed on mainline.

2003-07-23  Bob Wilson  <bob.wilson@acm.org>

        * elf32-xtensa.c (plt_reloc_count): Fix typo in comment.
        (elf_xtensa_size_dynamic_sections): Use elf_discarded_section.
        (elf_xtensa_combine_prop_entries): Avoid returning non-zero without
        first printing an error message.
        (elf_xtensa_finish_dynamic_sections): Likewise.
        (elf_xtensa_discard_info_for_section): Adjust size of .got.loc when
        discarding literal table entries.
        (elf_xtensa_merge_private_bfd_data): Remove newline from error 
message.
        (elf_xtensa_do_asm_simplify): Likewise.

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