From Mike Frysinger
        * gcc.target/bfin/mcpu-bf542.c: Check SILICON_REVISION is 0x0004.
        * gcc.target/bfin/mcpu-bf544.c, gcc.target/bfin/mcpu-bf547.c,
        gcc.target/bfin/mcpu-bf548.c, gcc.target/bfin/mcpu-bf549.c: Likewise.

From-SVN: r173333