[csa] Update CSA_ASSERT in StoreFixedArrayElement to accept PropertyArrays

Change-Id: I48adcad748a84dccbd542739f436dccfd6adca1d
Reviewed-on: https://chromium-review.googlesource.com/567725Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46571}

src/code-stub-assembler.cc

@@ -1526,10 +1526,12 @@ Node* CodeStubAssembler::StoreFixedArrayElement(Node* object, Node* index_node,
                                                 WriteBarrierMode barrier_mode,
                                                 int additional_offset,
                                                 ParameterMode parameter_mode) {
-  CSA_SLOW_ASSERT(this, IsFixedArray(object));
+  CSA_SLOW_ASSERT(this,
+                  Word32Or(IsFixedArray(object), IsPropertyArray(object)));
   CSA_SLOW_ASSERT(this, MatchesParameterMode(index_node, parameter_mode));
   DCHECK(barrier_mode == SKIP_WRITE_BARRIER ||
          barrier_mode == UPDATE_WRITE_BARRIER);
+  STATIC_ASSERT(FixedArray::kHeaderSize == PropertyArray::kHeaderSize);
   int header_size =
       FixedArray::kHeaderSize + additional_offset - kHeapObjectTag;
   Node* offset = ElementOffsetFromIndex(index_node, HOLEY_ELEMENTS,