Tests for VK_KHR_shader_float_controls

Tests for VK_KHR_shader_float_controls

Tests are executed for both compute and graphics stages,
for all three float widths and for two argument preparation
methods (passed via SSBO and generated in SPIR-V code).

Components: Vulkan

VK-GL-CTS issue: 1083

Affects:
dEQP-VK.api.info.get_physical_device_properties2.properties
dEQP-VK.api.info.get_physical_device_properties2.features
dEQP-VK.spirv_assembly.instruction.compute.float_controls.*
dEQP-VK.spirv_assembly.instruction.graphics.float_controls.*

Change-Id: I2bb10b7aa51283600051ecf67e845ed5f2b2093f
(cherry picked from commit 64edd2b341e49acf09be0f0807f0c2d635967171)