cmd/asm: add s390x instructions BLTU and BLEU

These instructions are the same as BLT and BLE except that they
also branch if the 'unordered' bit is set in the condition code.

They are already used by the SSA backend. This change allows them
to be used in hand-written assembly code.

Change-Id: Ie9b5985a5e87ea22e8043567a286e09dce16a2db
Reviewed-on: https://go-review.googlesource.com/29930
Run-TryBot: Michael Munday <munday@ca.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bill O'Farrell <billotosyr@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/asm/internal/arch/s390x.go

@@ -22,7 +22,9 @@ func jumpS390x(word string) bool {
 		"BGT",
 		"BL",
 		"BLE",
+		"BLEU",
 		"BLT",
+		"BLTU",
 		"BNE",
 		"BR",
 		"BVC",

src/cmd/asm/internal/asm/testdata/s390x.s

@@ -142,6 +142,8 @@ TEXT main·foo(SB),7,$16-0 // TEXT main.foo(SB), 7, $16-0
 	BLE	0(PC)                  // a7c40000
 	BGT	0(PC)                  // a7240000
 	BGE	0(PC)                  // a7a40000
+	BLTU	0(PC)                  // a7540000
+	BLEU	0(PC)                  // a7d40000
 
 	CMPBNE	R1, R2, 0(PC)          // ec1200007064
 	CMPBEQ	R3, R4, 0(PC)          // ec3400008064