[vm/shared] Fix StoreStaticField on x64, arm.

Follow-up to 6a377a4.
BUG=#61025
TEST=ci

Change-Id: Icf7082bb1a83f7578224d9145eee1473d671c52a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/440685
Reviewed-by: Alexander Markov <[email protected]>
Commit-Queue: Alexander Aprelev <[email protected]>

Author: aam

runtime/vm/compiler/backend/il_arm.cc

@@ -2957,8 +2957,14 @@ void StoreStaticFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
           : compiler::target::Thread::field_table_values_offset());
 
   // Note: static fields ids won't be changed by hot-reload.
-  __ StoreToOffset(value, temp,
-                   compiler::target::FieldTable::OffsetOf(field()));
+  if (field().is_shared()) {
+    __ StoreRelease(value,
+                    compiler::Address(
+                        temp, compiler::target::FieldTable::OffsetOf(field())));
+  } else {
+    __ StoreToOffset(value, temp,
+                     compiler::target::FieldTable::OffsetOf(field()));
+  }
 }
 
 LocationSummary* InstanceOfInstr::MakeLocationSummary(Zone* zone,

runtime/vm/compiler/backend/il_x64.cc

@@ -2500,13 +2500,13 @@ void StoreStaticFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
                   : compiler::target::Thread::field_table_values_offset()));
   // Note: static fields ids won't be changed by hot-reload.
   if (field().is_shared()) {
-    __ movq(compiler::Address(temp,
-                              compiler::target::FieldTable::OffsetOf(field())),
-            value);
-  } else {
     __ StoreRelease(value,
                     compiler::Address(
                         temp, compiler::target::FieldTable::OffsetOf(field())));
+  } else {
+    __ movq(compiler::Address(temp,
+                              compiler::target::FieldTable::OffsetOf(field())),
+            value);
   }
 }