[AMDGPU] Fix DS_WRITE_B32 patterns

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.

Differential Revision: https://reviews.llvm.org/D74868

Author: rampitec

llvm/lib/Target/AMDGPU/DSInstructions.td

@@ -725,7 +725,7 @@ 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">;
 }