gc: enable inlining by default

R=lvd, r
CC=golang-dev
https://golang.org/cl/5531058

src/cmd/gc/lex.c

@@ -234,6 +234,13 @@ main(int argc, char *argv[])
 		print("%cg version %s%s%s\n", thechar, getgoversion(), *p ? " " : "", p);
 		exits(0);
 	} ARGEND
+	
+	// enable inlining.  for now:
+	//	default: inlining on.  (debug['l'] == 1)
+	//	-l: inlining off  (debug['l'] == 0)
+	//	-ll, -lll: inlining on again, with extra debugging (debug['l'] > 1)
+	if(debug['l'] <= 1)
+		debug['l'] = 1 - debug['l'];
 
 	if(argc < 1)
 		usage();

test/escape2.go

-// errchk -0 $G -m $D/$F.go
+// errchk -0 $G -m -l $D/$F.go
 
 // Copyright 2010 The Go Authors.  All rights reserved.
 // Use of this source code is governed by a BSD-style