[AArch64] Improve BFD overflow warning message for -fpic

[Jiong Wang]

This patch gives the user more readable error message.

for R_AARCH64_LD64_GOTPAGE_LO15/R_AARCH64_LD32_GOTPAGE_LO14 overflow,
largely it's caused by too many GOT entry can't fit into -fpic model,
need to recompile using -fPIC to allow 4G GOT table size.


the new error message will be the following:

./ld-new  -shared -o tmpdir/dump tmpdir/dump0.o 
tmpdir/dump0.o:(.text+0x0): relocation truncated to fit: R_AARCH64_LD64_GOTPAGE_LO15 against undefined symbol `global_0'
tmpdir/dump0.o:(.text+0x0): warning: Too many GOT entries for -fpic, please recompile with -fPIC
./ld-new: final link failed: Nonrepresentable section on output

2015-07-28  Jiong Wang  <jiong.wang@arm.com>

bfd/
  * elfnn-aarch64.c (elfNN_aarch64_relocate_section): Add more warning message for
  R_AARCH64_LD64_GOTPAGE_LO15/R_AARCH64_LD32_GOTPAGE_LO14.
  
-- 
Regards,
Jiong

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