* flags.h: New flag (optimize_size).
        * toplev.c (main): Parse -Os option and set optimize_space
        accordingly.
        * gcc.c (default_compilers), cp/lang-specs.h, f/lang-specs.h: Define
        __OPTIMIZE_SIZE__ when compiling with -Os.
        * config/dsp16xx/dsp16xx.h, config/i386/i386.h,
        config/i386/dgux.h, config/i960/i960.h, config/pdp11/pdp11.h,
        config/v850/v850.h (OPTIMIZATION_OPTIONS): New SIZE argument
        to macro.
        * config/i386/i386.c (optimization_options): Accept new SIZE argument.

From-SVN: r17497