runtime: reduced struct sizes found via pahole

During my research of pahole with Go structs, I've found couple of
structs in runtime/ pkg where we can reduce several structs' sizes
highligted by pahole tool which detect byte holes and paddings.

Overall, there are 80 bytes reduced.

Change-Id: I398e5ed6f5b199394307741981cb5ad5b875e98f
Reviewed-on: https://go-review.googlesource.com/c/go/+/578795
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Joedian Reid <joedian@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/runtime/runtime2.go b/src/runtime/runtime2.go
index b58255f279..0093a6ddb9 100644
--- a/src/runtime/runtime2.go
+++ b/src/runtime/runtime2.go
@@ -510,12 +510,12 @@ type g struct {
 	sleepWhen     int64          // when to sleep until
 	selectDone    atomic.Uint32  // are we participating in a select and did someone win the race?
 
-	coroarg *coro // argument during coroutine transfers
-
 	// goroutineProfiled indicates the status of this goroutine's stack for the
 	// current in-progress goroutine profile
 	goroutineProfiled goroutineProfileStateHolder
 
+	coroarg *coro // argument during coroutine transfers
+
 	// Per-G tracer state.
 	trace gTraceState
 
@@ -604,8 +604,8 @@ type m struct {
 	// there's no stack to put them on. That is their sole purpose.
 	waitunlockf          func(*g, unsafe.Pointer) bool
 	waitlock             unsafe.Pointer
-	waitTraceBlockReason traceBlockReason
 	waitTraceSkip        int
+	waitTraceBlockReason traceBlockReason
 
 	syscalltick uint32
 	freelink    *m // on sched.freem