Avoid unaligned access fault in Int32x4/Float32x4::value() on ARM.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 728e2ffe6446a8833d056194b9aef8d727408440..f0ed3ff04efa33a533dc6d549ba22f214913bc29 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -22352,12 +22352,14 @@ RawFloat32x4* Float32x4::New(simd128_value_t value, Heap::Space space) {
 
 
 simd128_value_t Float32x4::value() const {
-  return simd128_value_t().readFrom(&raw_ptr()->value_[0]);
+  return ReadUnaligned(
+      reinterpret_cast<const simd128_value_t*>(&raw_ptr()->value_));
 }
 
 
 void Float32x4::set_value(simd128_value_t value) const {
-  StoreSimd128(&raw_ptr()->value_[0], value);
+  StoreUnaligned(reinterpret_cast<simd128_value_t*>(&raw()->ptr()->value_),
+                 value);
 }
 
 
@@ -22487,12 +22489,14 @@ int32_t Int32x4::w() const {
 
 
 simd128_value_t Int32x4::value() const {
-  return simd128_value_t().readFrom(&raw_ptr()->value_[0]);
+  return ReadUnaligned(
+      reinterpret_cast<const simd128_value_t*>(&raw_ptr()->value_));
 }
 
 
 void Int32x4::set_value(simd128_value_t value) const {
-  StoreSimd128(&raw_ptr()->value_[0], value);
+  StoreUnaligned(reinterpret_cast<simd128_value_t*>(&raw()->ptr()->value_),
+                 value);
 }