[PATCH] x86-64: Replace movzx with movzbl

[Fangrui Song]

Clang cannot assemble movzx in the AT&T dialect mode.

../sysdeps/x86_64/strcmp.S:2232:16: error: invalid operand for instruction
 movzx (%rsi), %ecx
               ^~~~

Change movzx to movzbl, which follows the AT&T dialect and is used
elsewhere in the file.
---
 sysdeps/x86_64/strcmp.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sysdeps/x86_64/strcmp.S b/sysdeps/x86_64/strcmp.S
index c7cbe4042a..bfe83abede 100644
--- a/sysdeps/x86_64/strcmp.S
+++ b/sysdeps/x86_64/strcmp.S
@@ -2229,8 +2229,8 @@ LABEL(strcmp_exitz):
 
 	.p2align 4
 LABEL(Byte0):
-	movzx	(%rsi), %ecx
-	movzx	(%rdi), %eax
+	movzbl	(%rsi), %ecx
+	movzbl	(%rdi), %eax
 
 #if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
 	leaq	_nl_C_LC_CTYPE_tolower+128*4(%rip), %rdx
-- 
2.33.1.1089.g2158813163f-goog