Fix compiler warning
Fix compiler warning

Compilers complained that m_resourceMapping is initialized before
m_rtState. m_resourceMapping does not have any arguments, so we can just
remove it’s explicit initialization in the constructor.

GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc