[llvm] [RuntimeDyld][LoongArch] Support large code model (PR #148584)

[Lu Weining via llvm-commits]

================
@@ -100,3 +103,42 @@ named_data:
     .quad 0x2222222222222222
     .quad 0x3333333333333333
     .size named_data, .-named_data
+
+    .section .sec.large.pc,"ax"
+    .globl test_large_pc
+test_large_pc:
+## Code after link should be:
+## 1a44444d pcalau12i $t1, 139810
+## 02c4440c addi.d    $t0, 273
----------------
SixWeining wrote:

```suggestion
## 02c4440c addi.d    $t0, $zero, 273
```

https://github.com/llvm/llvm-project/pull/148584