[AMDGPU] Fix DS_WRITE_B32 patterns

[rampitec]

Summary

It uses VGPR_32.RegTypes which includes 16 bit types. As a
result DS_WRITE_B32 may be generated for "store i16" which
is a bug. The only reason we do not hit it now is relative
patterns complexity and sorting. Should DS_WRITE_B16 pattern
complexity become higher and the bug appears.

llvm/lib/Target/AMDGPU/DSInstructions.td

multiclass DSAtomicWritePat_mc <DS_Pseudo inst, ValueType vt, string frag> {
   }
 }
 
 defm : DSWritePat_mc <DS_WRITE_B8, i32, "truncstorei8_local">;
 defm : DSWritePat_mc <DS_WRITE_B16, i32, "truncstorei16_local">;
 defm : DSWritePat_mc <DS_WRITE_B8, i16, "truncstorei8_local">;
 defm : DSWritePat_mc <DS_WRITE_B16, i16, "store_local">;
 
-foreach vt = VGPR_32.RegTypes in {
+foreach vt = Reg32Types.types in {
 defm : DSWritePat_mc <DS_WRITE_B32, vt, "store_local">;
 }
 
 defm : DSAtomicWritePat_mc <DS_WRITE_B32, i32, "atomic_store_local_32">;
 defm : DSAtomicWritePat_mc <DS_WRITE_B64, i64, "atomic_store_local_64">;
 
 let OtherPredicates = [D16PreservesUnusedBits] in {
 def : DSWritePat <DS_WRITE_B16_D16_HI, i32, store_hi16_local>;