[patch][gold] Fix pr18327

[Rafael Espíndola]

Full Changelog:

2015-04-27  Rafael Ávila de Espíndola <rafael.espindola@gmail.com>

PR gold/18327
* output.cc (Output_section::is_input_address_mapped): Assume a missing
entry is mapped.
* testsuite/Makefile.am: Add the eh_test test.
* testsuite/Makefile.in: Regenerate.
* testsuite/eh_test_a.cc: New test.
* testsuite/eh_test_b.cc: New test.

Cheers,
Rafael