shader: read S_MEMREALTIME from the host device clock shifted to about 100 MHz

src/graphics/shader/recompiler/backend/spirv/SpirvEmitter.h

@@ -13,6 +13,8 @@ namespace Libs::Graphics::ShaderRecompiler::Spirv {
 struct Profile {
 	bool maintenance8         = false; // Dynamic texel offsets on image samples.
 	bool native_float_min_max = false; // NMin/NMax give the guest's NaN and signed-zero results.
+	// OpReadClockKHR Device tick in picoseconds; 0 without shaderDeviceClock.
+	uint32_t device_clock_period_ps = 0;
 };
 
 inline constexpr Profile DefaultProfile {};