[COMMITTED, IA-64] doloop optimization across calls

[Jim Wilson]

I noticed this while working on PR43520.  Doloop by default does not
optimize loops with call insns.  However, on IA-64, the loop counter
register is call saved, so we can and should optimize such loops.  This
is fixed by replacing the default TARGET_INVALID_WITHIN_DOLOOP hook with
the null one, just like is already done in the s390 port.

This was tested with an ia64-linux C and C++ bootstrap and make check.
There were no regressions.  This was also tested by hand on some small
testcases to verify that it was doing what I expected.

I've checked in the patch.

Jim

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