[newlib-cygwin/main] RISC-V: memmove() size optimized version: Use compressed register

[Jeff Johnston]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=d3d814dfc2031acafc47fac071a38506c28bdddf

commit d3d814dfc2031acafc47fac071a38506c28bdddf
Author: m fally <marlene.fally@gmail.com>
Date:   Thu Apr 10 13:22:58 2025 +0200

    RISC-V: memmove() size optimized version: Use compressed register
    
    Replace register t2 with register a5, so that lb/sb instructions can be compressed.
    
    Reviewed-by: Christian Herber <christian.herber@oss.nxp.com>
    Signed-off-by: m fally <marlene.fally@gmail.com>

Diff:
---
 newlib/libc/machine/riscv/memmove.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/newlib/libc/machine/riscv/memmove.S b/newlib/libc/machine/riscv/memmove.S
index 66d9cd494..0f7216a68 100644
--- a/newlib/libc/machine/riscv/memmove.S
+++ b/newlib/libc/machine/riscv/memmove.S
@@ -26,8 +26,8 @@ memmove:
   add a1, a1, a4
 
 1:
-  lb t2, 0(a1)
-  sb t2, 0(t1)
+  lb a5, 0(a1)
+  sb a5, 0(t1)
   add   a2, a2, -1
   add   t1, t1, a3
   add   a1, a1, a3