cmd/compile: remove reflectdata.AfterGlobalEscapeAnalysis

This global variable was used by the old frontend to decide whether to
perform escape analysis during method wrapper generation.

The old frontend is gone now, the variable is not used anywhere else.

Change-Id: I448f2761ea608a9a2ec39a9920fcf7aa12d98799
Reviewed-on: https://go-review.googlesource.com/c/go/+/466278
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

src/cmd/compile/internal/gc/main.go

@@ -293,11 +293,6 @@ func Main(archInit func(*ssagen.ArchInfo)) {
 	base.Timer.Start("fe", "escapes")
 	escape.Funcs(typecheck.Target.Decls)
 
-	// TODO(mdempsky): This is a hack. We need a proper, global work
-	// queue for scheduling function compilation so components don't
-	// need to adjust their behavior depending on when they're called.
-	reflectdata.AfterGlobalEscapeAnalysis = true
-
 	// Collect information for go:nowritebarrierrec
 	// checking. This must happen before transforming closures during Walk
 	// We'll do the final check after write barriers are

src/cmd/compile/internal/reflectdata/reflect.go

@@ -1869,12 +1869,6 @@ func methodWrapper(rcvr *types.Type, method *types.Field, forItab bool) *obj.LSy
 	return lsym
 }
 
-// AfterGlobalEscapeAnalysis tracks whether package gc has already
-// performed the main, global escape analysis pass. If so,
-// methodWrapper takes responsibility for escape analyzing any
-// generated wrappers.
-var AfterGlobalEscapeAnalysis bool
-
 var ZeroSize int64
 
 // MarkTypeUsedInInterface marks that type t is converted to an interface.