internal/reflectlite: remove unused code

Change-Id: I87ae45657a9bae85b0fbf52692f15552a2987847
Reviewed-on: https://go-review.googlesource.com/c/go/+/738941
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

src/internal/reflectlite/value.go

@@ -464,17 +464,3 @@ func ifaceE2I(t *abi.Type, src any, dst unsafe.Pointer)
 //
 //go:noescape
 func typedmemmove(t *abi.Type, dst, src unsafe.Pointer)
-
-// Dummy annotation marking that the value x escapes,
-// for use in cases where the reflect code is so clever that
-// the compiler cannot follow.
-func escapes(x any) {
-	if dummy.b {
-		dummy.x = x
-	}
-}
-
-var dummy struct {
-	b bool
-	x any
-}