runtime: remove FlagNoProfile

Turns out to be unused as well.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews, khr
https://golang.org/cl/127170044

src/pkg/runtime/malloc.go

@@ -12,8 +12,7 @@ const (
 	debugMalloc = false
 
 	flagNoScan = 1 << 0 // GC doesn't have to scan object
-	flagNoProfiling = 1 << 1 // must not profile
-	flagNoZero      = 1 << 2 // don't zero memory
+	flagNoZero = 1 << 1 // don't zero memory
 
 	kindArray      = 17
 	kindFunc       = 19
@@ -300,16 +299,14 @@ marked:
 	if debug.allocfreetrace != 0 {
 		tracealloc(x, size, typ)
 	}
-	if flags&flagNoProfiling == 0 {
-		rate := MemProfileRate
-		if rate > 0 {
+
+	if rate := MemProfileRate; rate > 0 {
 		if size < uintptr(rate) && int32(size) < c.next_sample {
 			c.next_sample -= int32(size)
 		} else {
 			profilealloc(mp, x, size)
 		}
 	}
-	}
 
 	releasem(mp)
 

src/pkg/runtime/malloc.h

@@ -534,8 +534,7 @@ enum
 {
 	// flags to malloc
 	FlagNoScan	= 1<<0,	// GC doesn't have to scan object
-	FlagNoProfiling	= 1<<1,	// must not profile
-	FlagNoZero	= 1<<2, // don't zero memory
+	FlagNoZero	= 1<<1, // don't zero memory
 };
 
 void	runtime·MProf_Malloc(void*, uintptr);