string_pieceDeathTest for front() and back().
string_pieceDeathTest for front() and back().

antiagainst/shaderc,fuchsia-mirror/third_party-shaderc,dneto0/shaderc,drewet/shaderc,Qining/shaderc,Qining/shaderc,dneto0/shaderc,drewet/shaderc,Samana/shaderc,fuchsia-mirror/third_party-shaderc,dneto0/shaderc,AWoloszyn/shaderc,Qining/shaderc,antiagainst/shaderc,Samana/shaderc,AWoloszyn/shaderc,fuchsia-mirror/third_party-shaderc,davidlee80/shaderc,davidlee80/shaderc,dneto0/shaderc,antiagainst/shaderc,antiagainst/shaderc,AWoloszyn/shaderc,davidlee80/shaderc,drewet/shaderc,Samana/shaderc