[clang] [llvm] [LoongArch] Support LA V1.1 feature ld-seq-sa that don't generate dbar 0x700. (PR #116762)

[Lu Weining via cfe-commits]

================
@@ -1,5 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc --mtriple=loongarch64 -mattr=+d < %s | FileCheck %s --check-prefix=LA64
+; RUN: llc --mtriple=loongarch64 -mattr=+d,+ld-seq-sa < %s | FileCheck %s --check-prefix=LA64-LD-SEQ-SA
----------------
SixWeining wrote:

To reduce test lines:
```
; RUN: llc --mtriple=loongarch64 -mattr=+d,-ld-seq-sa < %s | FileCheck %s --check-prefixes=LA64,NO-LD-SEQ-SA
; RUN: llc --mtriple=loongarch64 -mattr=+d,+ld-seq-sa < %s | FileCheck %s --check-prefix=LA64
```

https://github.com/llvm/llvm-project/pull/116762