Add a testcase for branch shortening error with -O0 -fPIC.

2013-06-18  Anton Kolesov   <anton.kolesov@synopsys.com>

    * testsuite/gcc.target/arc/branch_shortening-O0-fPIC-1.c: Add a testcase
    for branch shortening error with -O0 -fPIC.
Merge pull request #13 from foss-for-synopsys-dwc-arc-processors/anton-testcase-branch_shortening

Add a testcase for branch shortening error with -O0 -fPIC.