cmd/compile: regenerate known formats for TestFormats

The formatting verb '%#x' was used for uint32 values in CL 132956.
This fixes TestFormats.

Change-Id: I3ab6519bde2cb74410fdca14829689cb46bf7022
Reviewed-on: https://go-review.googlesource.com/133595
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>

src/cmd/compile/fmt_test.go

@@ -724,6 +724,7 @@ var knownFormats = map[string]string{
 	"uint16 %d":        "",
 	"uint16 %v":        "",
 	"uint16 %x":        "",
+	"uint32 %#x":       "",
 	"uint32 %d":        "",
 	"uint32 %v":        "",
 	"uint32 %x":        "",