Remove no-op register move from ChaCha20_ctr32_ssse3_4x

r11 does not have anything in it yet, and r10 is never read. This is a
remnant of the ia32cap dispatch that we missed in
f5e0c8f92a22679b0cd8d24d0d670769c1cc07f3.

Bug: 673
Change-Id: I5cc179401418aee6479b4a38ae1c09f68ec40238
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/68291
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Bob Beck <bbe@google.com>

crypto/chacha/asm/chacha-x86_64.pl

diff --git a/crypto/chacha/asm/chacha-x86_64.pl b/crypto/chacha/asm/chacha-x86_64.pl
index 6d26b71..333ef9b 100755
--- a/crypto/chacha/asm/chacha-x86_64.pl
+++ b/crypto/chacha/asm/chacha-x86_64.pl
@@ -701,7 +701,6 @@
 	_CET_ENDBR
 	mov		%rsp,%r9		# frame pointer
 .cfi_def_cfa_register	r9
-	mov		%r10,%r11
 ___
 $code.=<<___;
 	sub		\$0x140+$xframe,%rsp

gen/crypto/chacha-x86_64-apple.S

diff --git a/gen/crypto/chacha-x86_64-apple.S b/gen/crypto/chacha-x86_64-apple.S
index a5e1207..d330661 100644
--- a/gen/crypto/chacha-x86_64-apple.S
+++ b/gen/crypto/chacha-x86_64-apple.S
@@ -459,7 +459,6 @@
 _CET_ENDBR
 	movq	%rsp,%r9
 
-	movq	%r10,%r11
 	subq	$0x140+8,%rsp
 	movdqa	L$sigma(%rip),%xmm11
 	movdqu	(%rcx),%xmm15

gen/crypto/chacha-x86_64-linux.S

diff --git a/gen/crypto/chacha-x86_64-linux.S b/gen/crypto/chacha-x86_64-linux.S
index 9dbf7d1..d76e6d0 100644
--- a/gen/crypto/chacha-x86_64-linux.S
+++ b/gen/crypto/chacha-x86_64-linux.S
@@ -465,7 +465,6 @@
 _CET_ENDBR
 	movq	%rsp,%r9
 .cfi_def_cfa_register	r9
-	movq	%r10,%r11
 	subq	$0x140+8,%rsp
 	movdqa	.Lsigma(%rip),%xmm11
 	movdqu	(%rcx),%xmm15

gen/crypto/chacha-x86_64-win.asm

diff --git a/gen/crypto/chacha-x86_64-win.asm b/gen/crypto/chacha-x86_64-win.asm
index 14f2395..f1f9a0d 100644
--- a/gen/crypto/chacha-x86_64-win.asm
+++ b/gen/crypto/chacha-x86_64-win.asm
@@ -511,7 +511,6 @@
 _CET_ENDBR
 	mov	r9,rsp
 
-	mov	r11,r10
 	sub	rsp,0x140+168
 	movaps	XMMWORD[(-168)+r9],xmm6
 	movaps	XMMWORD[(-152)+r9],xmm7