read Xtensa property tables more robustly

[Bob Wilson]

The bug I just fixed (an extra increment in relax_property_section) caused some 
property table entries to have no relocations, and the code for reading property 
tables assumed that either all the entries have relocations or none of them do. 
  That assumption is normally true but it is good to handle unexpected inputs. 
I've committed this patch that changes the table reader to walk through the 
table entries and relocations at the same time so that it can deal with entries 
with no relocations.  (It still ignores relocations on the size and/or flags 
fields, though.)  I tested this before I fixed the other bug, since without the 
bug, this situation doesn't come up.

bfd/
	* elf32-xtensa.c (xtensa_read_table_entries): Step through table
	contents and relocs in parallel.
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