examined soa-18 runfail

examples/intrinsics/known_fails.txt

@@ -13,3 +13,20 @@ __vec16_i64 (((uint64_t *)(&tmp__2_))[0], ((uint64_t *)(&tmp__2_))[0], ((uint64_
 *)(&tmp__2_))[0]
 ```
 where 'tmp__2_' is of  __vec16_i64 data type.
+
+2. soa-18.ispc (-O0)
+The same as (1). The generator uses the structure of a kind
+```
+struct l_unnamed_0 {
+  __vec16_i64 field0;
+  __vec16_i32 field1;
+} ptr_;
+```
+and a function
+```
+  __masked_store_i64(((&ptr_.field0)), _slice_ptr7_slice_offset_extract_0_, internal_mask_26_function_mask9_);
+```
+
+where '_slice_ptr7_slice_offset_extract_0_' is of type __vec16_i64. The
+problem is, we store 64 bit ints in memory sequentually and in vectors
+separately (hi and lo parts). This way, the '.field0' has wrong layout