test/codegen: fix PPC64 AddLargeConst test

Commit 061d77cb was published in parallel with another commit
36ecff08 which changed how certain constants were generated.

Update the test to account for the changes.

Change-Id: I314b735a34857efa02392b7a0dd9fd634e4ee428
Reviewed-on: https://go-review.googlesource.com/c/go/+/536256


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Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
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Auto-Submit: Paul Murphy <murp@ibm.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

test/codegen/arithmetic.go

@@ -16,12 +16,12 @@ package codegen
 
 func AddLargeConst(a uint64, out []uint64) {
 	// ppc64x/power10:"ADD\t[$]4294967296,"
-	// ppc64x/power9:"MOVD\t[$]i64.0000000100000000[(]SB[)]", "ADD\tR[0-9]*"
-	// ppc64x/power8:"MOVD\t[$]i64.0000000100000000[(]SB[)]", "ADD\tR[0-9]*"
+	// ppc64x/power9:"MOVD\t[$]1", "SLD\t[$]32" "ADD\tR[0-9]*"
+	// ppc64x/power8:"MOVD\t[$]1", "SLD\t[$]32" "ADD\tR[0-9]*"
 	out[0] = a + 0x100000000
 	// ppc64x/power10:"ADD\t[$]-8589934592,"
-	// ppc64x/power9:"MOVD\t[$]i64.fffffffe00000000[(]SB[)]", "ADD\tR[0-9]*"
-	// ppc64x/power8:"MOVD\t[$]i64.fffffffe00000000[(]SB[)]", "ADD\tR[0-9]*"
+	// ppc64x/power9:"MOVD\t[$]-1", "SLD\t[$]33" "ADD\tR[0-9]*"
+	// ppc64x/power8:"MOVD\t[$]-1", "SLD\t[$]33" "ADD\tR[0-9]*"
 	out[1] = a + 0xFFFFFFFE00000000
 }