[Committed][PR64895] Use actual_call_used_reg_set to find conflicting regs

[Tom de Vries]

Hi,

This patch fixes PR64895, related to the gcc.target/i386/fuse-caller-save*.c 
failures for -m32 -fpic.

Bootstrapped and reg-tested on x86_64 for unix/ and unix/-m32.
Build and reg-tested on x86_64 for unix/fpic and unix/fpic/-m32.

Approved here ( https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64895#c7 ):
...
The patch looks ok to me.  Tom, could you prepare the patch (check it mostly for 
x86-64 bootstrap and testsuite) and commit it to the trunk.  I approve it.
...

Thanks,
- Tom
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