[clang] [Clang] Remove 3-element vector load and store special handling (PR #104661)

[Shilei Tian via cfe-commits]

================
@@ -94,43 +94,43 @@ typedef double __attribute__((ext_vector_type(16))) double16;
 // CHECK-LABEL: @local_memory_alignment_global(
 // CHECK: store volatile i8 0, ptr addrspace(3) @local_memory_alignment_global.lds_i8, align 1
 // CHECK: store volatile <2 x i8> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v2i8, align 2
-// CHECK: store volatile <4 x i8> <i8 0, i8 0, i8 0, i8 undef>, ptr addrspace(3) @local_memory_alignment_global.lds_v3i8, align 4
+// CHECK: store volatile <3 x i8> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v3i8, align 4
 // CHECK: store volatile <4 x i8> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v4i8, align 4
 // CHECK: store volatile <8 x i8> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v8i8, align 8
 // CHECK: store volatile <16 x i8> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v16i8, align 16
 // CHECK: store volatile i16 0, ptr addrspace(3) @local_memory_alignment_global.lds_i16, align 2
 // CHECK: store volatile <2 x i16> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v2i16, align 4
-// CHECK: store volatile <4 x i16> <i16 0, i16 0, i16 0, i16 undef>, ptr addrspace(3) @local_memory_alignment_global.lds_v3i16, align 8
+// CHECK: store volatile <3 x i16> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v3i16, align 8
 // CHECK: store volatile <4 x i16> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v4i16, align 8
 // CHECK: store volatile <8 x i16> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v8i16, align 16
 // CHECK: store volatile <16 x i16> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v16i16, align 32
 // CHECK: store volatile i32 0, ptr addrspace(3) @local_memory_alignment_global.lds_i32, align 4
 // CHECK: store volatile <2 x i32> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v2i32, align 8
-// CHECK: store volatile <4 x i32> <i32 0, i32 0, i32 0, i32 undef>, ptr addrspace(3) @local_memory_alignment_global.lds_v3i32, align 16
+// CHECK: store volatile <3 x i32> zeroinitializer, ptr addrspace(3) @local_memory_alignment_global.lds_v3i32, align 16
----------------
shiltian wrote:

I'm not sure how we can define a 32-bit pointer at OpenCL level.

```
typedef private void * __attribute__((ext_vector_type(3))) pointer_32_3;
```

The above is definitely invalid code. Any suggestions?

https://github.com/llvm/llvm-project/pull/104661