i386.c: Replace "mcpu" with "mtune".

i386.c: Replace "mcpu" with "mtune".

        * config/i386/i386.c: Replace "mcpu" with "mtune".
        * config/i386/i386.h (TARGET_OPTIONS): Likewise.
        (CC1_CPU_SPEC): Likewise. New warning for "-mcpu".
        * doc/invoke.texi (i386 and x86-64 Options): Replace "mcpu"
        with "mtune".  Note that "mcpu" is a deprecated synonym for "mtune".

        * g++.old-deja/g++.other/store-expr1.C: Replace "mcpu"
        with "mtune".
        * g++.old-deja/g++.other/store-expr2.C: Likewise.
        * gcc.c-torture/execute/20010129-1.x: Likewise.
        * gcc.dg/20011107-1.c: Likewise.
        * gcc.dg/20020108-1.c: Likewise.
        * gcc.dg/20020122-3.c: Likewise.
        * gcc.dg/20020206-1.c: Likewise.
        * gcc.dg/20020310-1.c: Likewise.
        * gcc.dg/20020426-2.c: Likewise.
        * gcc.dg/20020517-1.c: Likewise.
        * gcc.dg/991230-1.c: Likewise.
        * gcc.dg/i386-unroll-1.c: Likewise.
        * gcc.misc-tests/i386-prefetch.exp: Likewise.

From-SVN: r63313