[PATCH 3/4] Fix undefined behaviour in libstdc++ testsuite

[Jonathan Wakely]

This one's a bit more involved. There are a number of calls to
char_traits<>::copy() and char_traits<>::compare() that incorrectly
use the length of the larger array, not the shorter one.

The specialization in testsuite/util/testsuite_character.cc was
setting a null terminator after the numpunct atoms, past the end of he
array.

    Fix out-of-bound array accesses in libstdc++ testsuite
    
    	* testsuite/21_strings/basic_string/modifiers/append/char/1.cc: Fix
    	reads past the end of strings.
    	* testsuite/21_strings/basic_string/operations/compare/char/1.cc:
    	Likewise.
    	* testsuite/21_strings/char_traits/requirements/short/1.cc: Fix
    	invalid array accesses.
    	* testsuite/experimental/string_view/operations/compare/char/1.cc:
    	Fix read past the end of string.
    	* testsuite/util/testsuite_character.cc: Fix out-of-bounds write.
 

Tested powerpc64-linux, committed to trunk.
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