Shader/SPIRV: Fix multiple branch handling (by splitting)

src/Nazara/Shader/SpirvWriter.cpp

@@ -488,6 +488,7 @@ namespace Nz
 			ShaderAst::SanitizeVisitor::Options options;
 			options.optionValues = states.optionValues;
 			options.removeCompoundAssignments = true;
+			options.splitMultipleBranches = true;
 
 			sanitizedAst = ShaderAst::Sanitize(shader, options);
 			targetAst = sanitizedAst.get();