Revert "cmd/compile,runtime: allocate defer records on the stack"

This reverts commit fff4f599fe1c21e411a99de5c9b3777d06ce0ce6.

Reason for revert: Seems to still have issues around GC.

Fixes #32452

Change-Id: Ibe7af629f9ad6a3d5312acd7b066123f484da7f0
Reviewed-on: https://go-review.googlesource.com/c/go/+/180761
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

1 files changed, 0 insertions, 55 deletions

diff --git a/src/runtime/stack_test.go b/src/runtime/stack_test.go
index 143d3a99a0..df73b3a1d5 100644
--- a/src/runtime/stack_test.go
+++ b/src/runtime/stack_test.go
@@ -799,58 +799,3 @@ func TestDeferLiveness(t *testing.T) {
 		t.Errorf("output:\n%s\n\nwant no output", output)
 	}
 }
-
-func TestDeferHeapAndStack(t *testing.T) {
-	P := 4     // processors
-	N := 10000 //iterations
-	D := 200   // stack depth
-
-	if testing.Short() {
-		P /= 2
-		N /= 10
-		D /= 10
-	}
-	c := make(chan bool)
-	for p := 0; p < P; p++ {
-		go func() {
-			for i := 0; i < N; i++ {
-				if deferHeapAndStack(D) != 2*D {
-					panic("bad result")
-				}
-			}
-			c <- true
-		}()
-	}
-	for p := 0; p < P; p++ {
-		<-c
-	}
-}
-
-// deferHeapAndStack(n) computes 2*n
-func deferHeapAndStack(n int) (r int) {
-	if n == 0 {
-		return 0
-	}
-	if n%2 == 0 {
-		// heap-allocated defers
-		for i := 0; i < 2; i++ {
-			defer func() {
-				r++
-			}()
-		}
-	} else {
-		// stack-allocated defers
-		defer func() {
-			r++
-		}()
-		defer func() {
-			r++
-		}()
-	}
-	r = deferHeapAndStack(n - 1)
-	escapeMe(new([1024]byte)) // force some GCs
-	return
-}
-
-// Pass a value to escapeMe to force it to escape.
-var escapeMe = func(x interface{}) {}