cmd/compile: remove -f flag

This is supposed to print out function stack frames, but it's been
broken since golang.org/cl/38593, and no one has noticed.

Change-Id: Iad428a9097d452b878b1f8c5df22afd6f671ac2e
Reviewed-on: https://go-review.googlesource.com/c/145199
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

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

@@ -205,7 +205,6 @@ func Main(archInit func(*Arch)) {
 	flag.BoolVar(&Ctxt.Flag_locationlists, "dwarflocationlists", true, "add location lists to DWARF in optimized mode")
 	flag.IntVar(&genDwarfInline, "gendwarfinl", 2, "generate DWARF inline info records")
 	objabi.Flagcount("e", "no limit on number of errors reported", &Debug['e'])
-	objabi.Flagcount("f", "debug stack frames", &Debug['f'])
 	objabi.Flagcount("h", "halt on error", &Debug['h'])
 	objabi.Flagfn1("importmap", "add `definition` of the form source=actual to import map", addImportMap)
 	objabi.Flagfn1("importcfg", "read import configuration from `file`", readImportCfg)
@@ -478,9 +477,6 @@ func Main(archInit func(*Arch)) {
 	finishUniverse()
 
 	typecheckok = true
-	if Debug['f'] != 0 {
-		frame(1)
-	}
 
 	// Process top-level declarations in phases.
 

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

@@ -5239,9 +5239,6 @@ func genssa(f *ssa.Func, pp *Progs) {
 	}
 
 	defframe(&s, e)
-	if Debug['f'] != 0 {
-		frame(0)
-	}
 
 	f.HTMLWriter.Close()
 	f.HTMLWriter = nil

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

@@ -954,36 +954,6 @@ func typehash(t *types.Type) uint32 {
 	return binary.LittleEndian.Uint32(h[:4])
 }
 
-func frame(context int) {
-	if context != 0 {
-		fmt.Printf("--- external frame ---\n")
-		for _, n := range externdcl {
-			printframenode(n)
-		}
-		return
-	}
-
-	if Curfn != nil {
-		fmt.Printf("--- %v frame ---\n", Curfn.Func.Nname.Sym)
-		for _, ln := range Curfn.Func.Dcl {
-			printframenode(ln)
-		}
-	}
-}
-
-func printframenode(n *Node) {
-	w := int64(-1)
-	if n.Type != nil {
-		w = n.Type.Width
-	}
-	switch n.Op {
-	case ONAME:
-		fmt.Printf("%v %v G%d %v width=%d\n", n.Op, n.Sym, n.Name.Vargen, n.Type, w)
-	case OTYPE:
-		fmt.Printf("%v %v width=%d\n", n.Op, n.Type, w)
-	}
-}
-
 // updateHasCall checks whether expression n contains any function
 // calls and sets the n.HasCall flag if so.
 func updateHasCall(n *Node) {