Revert "[libc][RISCV] Add naked attribute to setjmp/longjmp (#100036)"

This reverts commit 05b586b.

Author: ilovepi

libc/src/setjmp/riscv/longjmp.cpp

@@ -30,7 +30,6 @@
 
 namespace LIBC_NAMESPACE_DECL {
 
-[[gnu::naked]]
 LLVM_LIBC_FUNCTION(void, longjmp, (__jmp_buf * buf, int val)) {
   LOAD(ra, buf->__pc);
   LOAD(s0, buf->__regs[0]);

libc/src/setjmp/riscv/setjmp.cpp

@@ -29,7 +29,6 @@
 
 namespace LIBC_NAMESPACE_DECL {
 
-[[gnu::naked]]
 LLVM_LIBC_FUNCTION(int, setjmp, (__jmp_buf * buf)) {
   STORE(ra, buf->__pc);
   STORE(s0, buf->__regs[0]);