re PR go/64683 (FAIL: runtime/pprof -- testing.go:278: The entry did not match)

	PR go/64683
runtime/pprof: Let memory profiler test pass if value not collected.

Since gccgo's GC is not precise, the transient value may not
be collected.  Let the regexp match that case as well.

From-SVN: r219900

libgo/go/runtime/pprof/mprof_test.go

@@ -85,10 +85,12 @@ func TestMemoryProfiler(t *testing.T) {
 #	0x[0-9,a-f]+	runtime_pprof_test\.TestMemoryProfiler\+0x[0-9,a-f]+	.*/mprof_test.go:64
 `, (1<<10)*memoryProfilerRun, (1<<20)*memoryProfilerRun),
 
-		fmt.Sprintf(`0: 0 \[%v: %v\] @ 0x[0-9,a-f x]+
+		// This should start with "0: 0" but gccgo's imprecise
+		// GC means that sometimes the value is not collected.
+		fmt.Sprintf(`(0|%v): (0|%v) \[%v: %v\] @ 0x[0-9,a-f x]+
 #	0x[0-9,a-f]+	pprof_test\.allocateTransient2M\+0x[0-9,a-f]+	.*/mprof_test.go:30
 #	0x[0-9,a-f]+	runtime_pprof_test\.TestMemoryProfiler\+0x[0-9,a-f]+	.*/mprof_test.go:65
-`, memoryProfilerRun, (2<<20)*memoryProfilerRun),
+`, memoryProfilerRun, (2<<20)*memoryProfilerRun, memoryProfilerRun, (2<<20)*memoryProfilerRun),
 	}
 
 	for _, test := range tests {