Remove i16 result mubuf types.

This would only be used if we started using direct i16
values on gfx6/gfx7, but they should legalize all to i32

Author: arsenm

llvm/lib/Target/AMDGPU/BUFInstructions.td

@@ -988,8 +988,6 @@ defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_USHORT", i32, atomic_load_16_global>;
 defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_USHORT", i32, atomic_load_zext_16_global>;
 defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_UBYTE", i16, atomic_load_8_global>;
 defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_USHORT", i16, atomic_load_16_global>;
-defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_UBYTE", i16, atomic_load_zext_8_global>;
-defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_USHORT", i16, atomic_load_zext_16_global>;
 defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_UBYTE", i32, extloadi8_global>;
 defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_UBYTE", i32, zextloadi8_global>;
 defm : MUBUF_Pseudo_Load_Pats<"BUFFER_LOAD_SBYTE", i32, sextloadi8_global>;