[PLT-7055] Modified code arrangement for compatibility with 32-bit ARM (#7281)

Squashed commit of the following:

commit ba8e052d40f27123fbb5a94e9b30c05f51b90d36
Author: Christopher Brown <ccbrown112@gmail.com>
Date:   Fri Sep 1 12:08:57 2017 -0500

    style fixes

commit 121649f92f313813d9f105ddffb7d02ce5d3736f
Author: Syakyr Surani <coding@syakyr.me>
Date:   Sat Aug 26 10:19:14 2017 +0800

    Added comments for ARM/x86 (32-bit) compatibility

commit 4bd13dd0e378cd4866bd5aed762f2b4fb75d7de9
Author: Syakyr Surani <coding@syakyr.me>
Date:   Sat Aug 26 05:20:43 2017 +0800

    Added comments for ARM/x86 (32-bit) compatibility

commit 78027f616ab736076cef0b1fd8b3266b3c3010dc
Author: Syakyr Surani <coding@syakyr.me>
Date:   Thu Aug 24 03:01:06 2017 +0800

    [PLT-7055] Modified code arrangement for compatibility with 32-bit ARM

app/web_hub.go

@@ -27,8 +27,10 @@ const (
 )
 
 type Hub struct {
-	connections     []*WebConn
+	// connectionCount should be kept first.
+	// See https://github.com/mattermost/platform/pull/7281
 	connectionCount int64
+	connections     []*WebConn
 	connectionIndex int
 	register        chan *WebConn
 	unregister      chan *WebConn

store/sql_supplier.go

@@ -83,12 +83,14 @@ type SqlSupplierOldStores struct {
 }
 
 type SqlSupplier struct {
+	// rrCounter and srCounter should be kept first.
+	// See https://github.com/mattermost/platform/pull/7281
+	rrCounter      int64
+	srCounter      int64
 	next           LayeredStoreSupplier
 	master         *gorp.DbMap
 	replicas       []*gorp.DbMap
 	searchReplicas []*gorp.DbMap
-	rrCounter      int64
-	srCounter      int64
 	oldStores      SqlSupplierOldStores
 }