4.6 GetGlobalShaderMap

In a plugin I have code that called GetGlobalShaderMap without any parameters. In 4.4 this called:

TShaderMap<FGlobalShaderType>* GetGlobalShaderMap(EShaderPlatform Platform=GRHIShaderPlatform, bool bRefreshShaderMap=false);

There now is no parameterless GetGlobalShaderMap, I must presumably specify a ShaderPlatform. The default parameter of GRHIShaderPlatform doesn’t exist any more.

What should I replace this call with?