Testcase for fortran/PR3743 "Reference to intrinsic `ISHFT' invalid".

[David Edelsohn]

	With Andreas Jaeger's help I tracked down the mystery of why this
test only fails on certain targets.  The intrinsic array contains 380
lines.  bsearch on Linux and HPUX is starting one entry beyond the
midpoint (191) and bsearch on AIX, Solaris, and Irix is starting one entry
before the midpoint (190).  Linux and HPUX binary search happen to land
exactly on the bit_size entry, so the search succeeds despite the bug.

David