No more testsuite failures on questa-2023.1 and vivado-2023.1

[christiaanb]

Running:

cabal run clash-testsuite

Used to fail on the following tests:

BlackBox/T1524/SystemVerilog/ModelSim
DDR/DDRout/Verilog/tools/Vivado/testBenchUA;testBenchUS;techbenchGA;testbenchGS
HOPrim/Transpose/SystemVerilog/ModelSim
Vector/VMerge/SystemVerilog/ModelSim

On my machine, which has:

• Questa Intel FPGA Stater Edition 2023.1
• Xilinx Vivado 2023.1

With the commits in this PR, all tests pass on my machine.