cmd/compile: change the "bogus line" to be 1

The previous value was "too bogus" and caused objdump to crash.
Updated infinite loop test results (only run if -args -f) in ssa/debug_test.go
Probably also fixes #36621 but that bug needs more info to tell for certain.

Fixes #36570

Change-Id: I51144641d25d559308a98d726d87806bd340cc5a
Reviewed-on: https://go-review.googlesource.com/c/go/+/215297
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

src/cmd/compile/internal/ssa/testdata/infloop.dlv-opt.nexts

@@ -2,11 +2,11 @@
 6:	func test() {
 8:		go func() {}()
 10:		for {
-1048575:
+1:	package main
 10:		for {
-1048575:
+1:	package main
 10:		for {
-1048575:
+1:	package main
 10:		for {
-1048575:
+1:	package main
 10:		for {

src/cmd/internal/src/pos.go

@@ -305,7 +305,7 @@ type lico uint32
 // because they have almost no interaction with other uses of the position.
 const (
 	lineBits, lineMax     = 20, 1<<lineBits - 2
-	bogusLine             = 1<<lineBits - 1 // Not a line number; used to disrupt infinite loops
+	bogusLine             = 1 // Used to disrupt infinite loops to prevent debugger looping
 	isStmtBits, isStmtMax = 2, 1<<isStmtBits - 1
 	xlogueBits, xlogueMax = 2, 1<<xlogueBits - 1
 	colBits, colMax       = 32 - lineBits - xlogueBits - isStmtBits, 1<<colBits - 1

src/cmd/objdump/testdata/fmthello.go

@@ -4,9 +4,15 @@ import "fmt"
 
 func main() {
 	Println("hello, world")
+	if flag {
+		for {
+		}
+	}
 }
 
 //go:noinline
 func Println(s string) {
 	fmt.Println(s)
 }
+
+var flag bool