Test that movsd without arguments is left as-is.

This works fine, but probably worth a test.

Change-Id: If060b473958c1664e450102cafe0ca28951bff49
Reviewed-on: https://boringssl-review.googlesource.com/20444
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

util/fipstools/testdata/x86_64-GOTRewrite/in.s

@@ -26,6 +26,9 @@ foo:
 	movsd foo@GOTPCREL(%rip), %xmm0
 	vmovsd foo@GOTPCREL(%rip), %xmm0
 
+	# movsd without arguments should be left as-is.
+	movsd
+
 	# Synthesized symbols do not use the GOT.
 	movq BORINGSSL_bcm_text_start@GOTPCREL(%rip), %r11
 	movq foobar_bss_get@GOTPCREL(%rip), %r11

util/fipstools/testdata/x86_64-GOTRewrite/out.s

@@ -113,6 +113,9 @@ foo:
 	popq %rax
 	leaq 128(%rsp), %rsp
 
+	# movsd without arguments should be left as-is.
+	movsd
+
 	# Synthesized symbols do not use the GOT.
 # WAS movq BORINGSSL_bcm_text_start@GOTPCREL(%rip), %r11
 	leaq	BORINGSSL_bcm_text_start(%rip), %r11