[arm] Use prel31 in EH table indices

[Paul Brook]

The first word of an Arm exception index table should be an R_ARM_PREL31 
relocation of the function start. We were using R_ARM_REL32.

Tested with cross to arm-none-eabi.
Ok?

Paul

2004-12-08  Paul Brook  <paul@codesourcery.com>

 * config/tc-arm.c (s_arm_unwind_fnend): Use R_ARM_PREL31 relocation
 for function start.
 * testsuite/gas/arm/unwind.d: Expect R_ARM_PREL31 relocations.
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