ac/llvm: Fix nonportable sizeof.

Fix defect reported by Coverity.

Sizeof not portable (SIZEOF_MISMATCH)
suspicious_sizeof: Passing argument vec_size * 8UL /* sizeof
(LLVMValueRef *) */ to function __builtin_alloca and then casting
the return value to LLVMValueRef * is suspicious. In this
particular case sizeof (LLVMValueRef *) happens to be equal to
sizeof (LLVMValueRef), but this is not a portable assumption.

Fixes: ca74603b4f ("ac/llvm: add better code for isign")
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6682>

src/amd/llvm/ac_llvm_build.c

@@ -2438,7 +2438,7 @@ LLVMValueRef ac_const_uint_vec(struct ac_llvm_context *ctx, LLVMTypeRef type, ui
    if (LLVMGetTypeKind(type) == LLVMVectorTypeKind) {
       LLVMValueRef scalar = LLVMConstInt(LLVMGetElementType(type), value, 0);
       unsigned vec_size = LLVMGetVectorSize(type);
-      LLVMValueRef *scalars = alloca(vec_size * sizeof(LLVMValueRef *));
+      LLVMValueRef *scalars = alloca(vec_size * sizeof(LLVMValueRef));
 
       for (unsigned i = 0; i < vec_size; i++)
          scalars[i] = scalar;