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Replace the flags --include-debug-symbols and --include-cfi
with single flag called --generate-debug-info (with alias -g).

The name "symbol" was not ideal, since depending on context it
may be interpreted as "ELF symbols", or "debugging information".

This CL also means that we have only the options to include
either all debugging information or none.  This should be fine,
since we can use standard tools to strip anything we do not want.

Change-Id: I721fded56d755d7eed0ef36aa84e841a1f5747f8