[llvm] [LoongArch] Fix a typo in getVariantKindName (NFC) (PR #79567)

[via llvm-commits]

https://github.com/zhaoqi5 created https://github.com/llvm/llvm-project/pull/79567

Looks like a slip of the pen.

>From df8b1e31f2f9eb47bf4f18d6b15524b9132d9dd1 Mon Sep 17 00:00:00 2001
From: zhaoqi <zhaoqi01 at loongson.cn>
Date: Fri, 26 Jan 2024 09:19:51 +0800
Subject: [PATCH] [LoongArch] Fix a typo in getVariantKindName (NFC)

Looks like a slip of the pen.
---
 llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCExpr.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCExpr.cpp b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCExpr.cpp
index 8ca8876a19b936f..d6fa3b6e50968c8 100644
--- a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCExpr.cpp
+++ b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCExpr.cpp
@@ -73,7 +73,7 @@ StringRef LoongArchMCExpr::getVariantKindName(VariantKind Kind) {
   case VK_LoongArch_B21:
     return "b21";
   case VK_LoongArch_B26:
-    return "b21";
+    return "b26";
   case VK_LoongArch_ABS_HI20:
     return "abs_hi20";
   case VK_LoongArch_ABS_LO12: