[musl] loongarch64: Add lsx and lasx regset definition

[lixing <lixing@loongson.cn>]

Hi Rich,

When building the upstream binutils-gdb, we found that the lack of lsx 
and lasx regset definition lead to the compiling work error.

we need to add elf_lsxregset_t and elf_lasxregset_t definition in 
loongarch64.


  arch/loongarch64/bits/user.h | 12 ++++++++++++
  1 file changed, 12 insertions(+)

diff --git a/arch/loongarch64/bits/user.h b/arch/loongarch64/bits/user.h
index fd9b7b22..10e1be45 100644
--- a/arch/loongarch64/bits/user.h
+++ b/arch/loongarch64/bits/user.h
@@ -22,3 +22,15 @@ typedef union {
         float f;
  } elf_fpreg_t;
  typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
+
+typedef union
+{
+       double d[2];
+       float f[4];
+} elf_lsxregset_t[32] __attribute__((__aligned__(16)));
+
+typedef union
+{
+       double d[4];
+       float f[8];
+} elf_lasxregset_t[32] __attribute__((__aligned__(32)));


Thank you.