i#2946 xsave area size: Adjust expected xsave area size for AVX-512 machines. (#3495)
i#2946 xsave area size: Adjust expected xsave area size for AVX-512 machines. (#3495)

The test client.drutil-test was failing on AVX-512 machines, because the expected xsave
area size was constraint too small. This adjusts the test for machines that save the
AVX-512 state.

Fixes #2946
AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio