turnip: valgrind warning on float_controls tests
Perhaps we're not filling in a struct as required? There is a float_controls impl we should probably pull out of !4695 (closed)
Test case 'dEQP-VK.spirv_assembly.instruction.compute.float_controls.fp32.input_args.rounding_rte_add'..
==7048== Conditional jump or move depends on uninitialised value(s)
==7048== at 0x961FB8: vkt::SpirVAssembly::isFloatControlsFeaturesSupported(vkt::Context const&, vk::VkPhysicalDeviceFloatControlsProperties const&) (vktSpvAsmUtils.cpp:260)
==7048== by 0xA4F19F: vkt::SpirVAssembly::SpvAsmComputeShaderCase::checkSupport(vkt::Context&) const (vktSpvAsmComputeShaderCase.cpp:442)
==7048== by 0x2E7D8F: vkt::TestCaseExecutor::init(tcu::TestCase*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) (vktTestPackage.cpp:272)
==7048== by 0x1BD1E13: tcu::TestSessionExecutor::enterTestCase(tcu::TestCase*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) (tcuTestSessionExecutor.cpp:209)
==7048== by 0x1BD2A5F: tcu::TestSessionExecutor::iterate() (tcuTestSessionExecutor.cpp:107)
==7048== by 0x1BB16F7: tcu::App::iterate() (tcuApp.cpp:173)
==7048== by 0x2D98DB: main (tcuMain.cpp:58)
==7048==