test/bench/go1: reduce fasta data size for mips{,64}

Change-Id: I15887ee454acfdb36334dd9f0b59cc520b2b0286
Reviewed-on: https://go-review.googlesource.com/34311Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

test/bench/go1/fasta_test.go

@@ -12,10 +12,10 @@ var fastabytes = makefasta()
 
 func makefasta() []byte {
 	var n int = 25e6
-	if runtime.GOARCH == "arm" {
+	if runtime.GOARCH == "arm" || runtime.GOARCH == "mips" || runtime.GOARCH == "mips64" {
 		// TODO(dfc) remove this limitation after precise gc.
 		// A value of 25e6 consumes 465mb of heap on 32bit
-		// platforms, which is too much for most ARM systems.
+		// platforms, which is too much for some systems.
 		// A value of 25e5 produces a memory layout that
 		// confuses the gc on 32bit platforms. So 25e4 it is.
 		n = 25e4