[testsuite] gcov.exp: include flags in test summary lines

[Janis Johnson]

GCOV tests for C++ are run for both std=gnu++98 and std=gnu++11.  Those
options are not reported by GCOV-specific lines in the test summary,
leading to non-unique lines.  This patch modifies the GCOV test support
to use a testname that includes the extra flags used for a set of tests
and also modifies the format of summary lines to better incorporate that
information.  For example, these lines:

  PASS: gcc.misc-tests/gcov-1.c:17 line count
  PASS: gcc.misc-tests/gcov-1.c gcov

  PASS: g++.dg/gcov/gcov-1.C:279 line count
  PASS: g++.dg/gcov/gcov-1.C gcov

are now:

  PASS: gcc.misc-tests/gcov-1.c count for line 17
  PASS: gcc.misc-tests/gcov-1.c gcov

  PASS: g++.dg/gcov/gcov-1.C -std=gnu++98 count for line 279
  PASS: g++.dg/gcov/gcov-1.C -std=gnu++98 gcov
  PASS: g++.dg/gcov/gcov-1.C -std=gnu++11 count for line 279
  PASS: g++.dg/gcov/gcov-1.C -std=gnu++11 gcov

Tested on i686-pc-linux-gnu and arm-eabi for gcc and g++ GCOV tests.
OK for mainline?

Janis
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