fix avx-1 amd64 test

fix avx-1 amd64 test

The estimate instructions (rcpss, rcpps, rsqrtps, rsqrtss) are, as the
name suggests, not expected to give a fully accurate result. They may
produce slighly different results on different CPU families because
their results are not defined by the IEEE standard.  This is the
reason avx-1 test fails on amd now.

This patch assumes there are only two implementations, the intel and
amd one.  It moves these estimate instructions out of avx-1 and into
their own testcase - avx_estimate_insn and creates two different .exp
files for intel and amd.

https://bugs.kde.org/show_bug.cgi?id=413330