[Autobackout][FuncReg]Revert of change: c24df24

 Fix layout struct copy

For struct type, GetType() (to get its visa type) is byte always. When doing
struct layout copy, need to use int type that is the same size as its member.

For example, a copy from uniform Src to uniform Dst, both are of the struct
type as below:
    struct.soa { struct.aos {i8, i8, i8 ,i8}, struct.aos {i8, i8, i8, i8} }
As its member is 4 bytes, the copy will be using dw as copy type:
    mov (2)  Dst:d  Src:d

Author: jgu222

IGC/Compiler/CISACodeGen/EmitVISAPass.cpp

@@ -9308,13 +9308,9 @@ void EmitPass::emitCopyFromLayoutStruct(Value* D, Value* S)
     }
 
     uint32_t sTyBytes = (uint32_t)DL.getTypeStoreSize(sTy);
-    // dEltTy : copy type
-    //   struct member could be vector, so take its scalar type.
-    //   Use int type for copy always.
+    // struct member could be vector, so take its scalar type.
     Type* dEltTy = sTy->getElementType(0)->getScalarType();
     uint32_t dEltBytes = (uint32_t)DL.getTypeStoreSize(dEltTy);
-    // dEltTy could be of struct or float, int, etc. Here, use int type.
-    dEltTy = Type::getIntNTy(dEltTy->getContext(), dEltBytes * 8);
     // dNElts in unit of dEltTy.
     //   Note Legal struct has its size be multiple of dEltTy.
     IGC_ASSERT((sTyBytes % dEltBytes) == 0);