This backport contains 1 patch from gcc main stream tree.
The commit id of these patchs list as following in the order of time.

0001-tree-ssa-sccvn.c-copy_reference_ops_from_ref-Adjust-.patch
2f215d2176608467aeee73b245beedfc60836b71

diff -Nurp gcc-9.3.0_org/gcc/tree-ssa-sccvn.c gcc-9.3.0/gcc/tree-ssa-sccvn.c
--- gcc-9.3.0_org/gcc/tree-ssa-sccvn.c	2020-08-18 15:31:39.308000000 +0800
+++ gcc-9.3.0/gcc/tree-ssa-sccvn.c	2020-08-18 15:32:03.456000000 +0800
@@ -797,39 +797,6 @@ vn_reference_eq (const_vn_reference_t co
 static void
 copy_reference_ops_from_ref (tree ref, vec<vn_reference_op_s> *result)
 {
-  if (TREE_CODE (ref) == TARGET_MEM_REF)
-    {
-      vn_reference_op_s temp;
-
-      result->reserve (3);
-
-      memset (&temp, 0, sizeof (temp));
-      temp.type = TREE_TYPE (ref);
-      temp.opcode = TREE_CODE (ref);
-      temp.op0 = TMR_INDEX (ref);
-      temp.op1 = TMR_STEP (ref);
-      temp.op2 = TMR_OFFSET (ref);
-      temp.off = -1;
-      temp.clique = MR_DEPENDENCE_CLIQUE (ref);
-      temp.base = MR_DEPENDENCE_BASE (ref);
-      result->quick_push (temp);
-
-      memset (&temp, 0, sizeof (temp));
-      temp.type = NULL_TREE;
-      temp.opcode = ERROR_MARK;
-      temp.op0 = TMR_INDEX2 (ref);
-      temp.off = -1;
-      result->quick_push (temp);
-
-      memset (&temp, 0, sizeof (temp));
-      temp.type = NULL_TREE;
-      temp.opcode = TREE_CODE (TMR_BASE (ref));
-      temp.op0 = TMR_BASE (ref);
-      temp.off = -1;
-      result->quick_push (temp);
-      return;
-    }
-
   /* For non-calls, store the information that makes up the address.  */
   tree orig = ref;
   while (ref)
@@ -859,6 +826,20 @@ copy_reference_ops_from_ref (tree ref, v
 	  temp.base = MR_DEPENDENCE_BASE (ref);
 	  temp.reverse = REF_REVERSE_STORAGE_ORDER (ref);
 	  break;
+	case TARGET_MEM_REF:
+	  /* The base address gets its own vn_reference_op_s structure.  */
+	  temp.op0 = TMR_INDEX (ref);
+	  temp.op1 = TMR_STEP (ref);
+	  temp.op2 = TMR_OFFSET (ref);
+	  temp.clique = MR_DEPENDENCE_CLIQUE (ref);
+	  temp.base = MR_DEPENDENCE_BASE (ref);
+	  result->safe_push (temp);
+	  memset (&temp, 0, sizeof (temp));
+	  temp.type = NULL_TREE;
+	  temp.opcode = ERROR_MARK;
+	  temp.op0 = TMR_INDEX2 (ref);
+	  temp.off = -1;
+	  break;
 	case BIT_FIELD_REF:
 	  /* Record bits, position and storage order.  */
 	  temp.op0 = TREE_OPERAND (ref, 1);