PATCH: Fix ld-shared tests for gcc 4.3

[H.J. Lu]

Gcc 4.3 can optimize

extern int shlib_overriddencall2 ();

int
shlib_shlibcall2 ()
{
  return shlib_overriddencall2 ();
}
int
shlib_overriddencall2 ()
{
  return 7;
}

to

int
shlib_shlibcall2 ()
{
  return 7;
}

at -O2 without -fPIC. It causes "make check" failures on Linux/i386 in ld:

FAIL: shared (non PIC)
FAIL: shared (non PIC, load offset)
FAIL: shared (PIC main, non PIC so)

This patch moves shlib_overriddencall2 to sh2.c so that gcc won't
optimize it out.
I will check it in as an obvious fix. Tested on Linux/ia32,
Linux/Intel64 and Linux/ia64.


H.J.
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