cc-with-tweaks.sh: Use gdb-add-index.sh

With DWARF-5 .debug_names, the commands to add the index to the symbol
file are more complicated, as now also .debug_str needs to be
modified.

Currently, contrib/cc-with-tweaks.sh calls objcopy to handle the '-i'
option instead of using contrib/gdb-add-index.sh which basically does
the same.  To help with .debug_names, this commit makes
contrib/cc-with-tweaks.sh reuse contrib/gdb-add-index.sh instead.

A problem this ran into is whether contrib/cc-with-tweaks.sh should
fail or not when no index is produced.

Currently, contrib/cc-with-tweaks.sh is more quiet (=successful) than
contrib/gdb-add-index.sh and so with no further changes testsuite runs
with an index would "regress".  This commit tries to keep the behavior
unchanged.  Some cases still error with:
	Ada is not currently supported by the index
But some cases (such as some trivial gdb.dwarf2/ testcases with no DWARF data
to index) produce no index while the testcases still PASS now instead of:
	-PASS: gdb.arch/i386-bp_permanent.exp: stack pointer value matches
	+gdb compile failed, gdb-add-index.sh: No index was created for gdb/testsuite.unix.-m64/outputs/gdb.arch/i386-bp_permanent/i386-bp_permanent
	+gdb-add-index.sh: [Was there no debuginfo? Was there already an index?]
	+UNTESTED: gdb.arch/i386-bp_permanent.exp: failed to compile

gdb/ChangeLog
2017-12-08  Jan Kratochvil  <jan.kratochvil@redhat.com>
	    Pedro Alves  <palves@redhat.com>

	* contrib/cc-with-tweaks.sh: Change interpreter to bash, incl. initial
	comment.
	(GDB_ADD_INDEX): New variable.
	<$want_index>: Call $GDB_ADD_INDEX.

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