[LoongArch][CodeGen] Implement 128-bit and 256-bit vector shuffle. (llvm#100054)

[LoongArch][CodeGen] Implement 128-bit and 256-bit vector shuffle
operations.

In LoongArch, shuffle operations can be divided into two types:
- Single-vector shuffle: Shuffle using only one vector, with the other
vector being `undef` or not selected by mask. This can be expanded to
instructions such as `vreplvei` and `vshuf4i`.
- Two-vector shuffle: Shuflle using two vectors. This can be expanded to
instructions like `vilv[l/h]`, `vpack[ev/od]`, `vpick[ev/od]` and the
basic `vshuf`.

In the future, more optimizations may be added, such as handling 1-bit
vectors and processing single element patterns, etc.

(cherry picked from commit 464ea88)
Change-Id: I1ea504e1c0d394cc56c48e04ea32cb990c5bd31e

Author: ylzsx

clang/lib/Driver/ToolChains/Arch/LoongArch.cpp

@@ -216,15 +216,15 @@ void loongarch::getLoongArchTargetFeatures(const Driver &D,
       // Option -msimd=lsx depends on 64-bit FPU.
       // -m*-float and -mfpu=none/0/32 conflict with -mlsx.
       if (llvm::find(Features, "-d") != Features.end())
-        D.Diag(diag::err_drv_loongarch_wrong_fpu_width) << /*LSX*/ 0;
+        D.Diag(diag::err_drv_loongarch_wrong_fpu_width_for_lsx);
       // The previous option does not contain feature -lsx.
       else if (llvm::find(Features, "-lsx") == Features.end())
         Features.push_back("+lsx");
     } else if (MSIMD == "lasx") {
       // Option -msimd=lasx depends on 64-bit FPU and LSX.
       // -m*-float and -mfpu=none/0/32 conflict with -mlsx.
       if (llvm::find(Features, "-d") != Features.end())
-        D.Diag(diag::err_drv_loongarch_wrong_fpu_width) << /*LASX*/ 1;
+        D.Diag(diag::err_drv_loongarch_wrong_fpu_width_for_lasx);
       else if (llvm::find(Features, "-lsx") != Features.end())
         D.Diag(diag::err_drv_loongarch_invalid_simd_option_combination);
       // The previous option does not contain feature -lasx.