Fix for the removed DataLayout constructor. (#8391)

* Fix for the removed DataLayout constructor.

* Update CodeGen_LLVM.cpp

* Update CodeGen_LLVM.cpp

* Update CodeGen_LLVM.cpp

---------

Co-authored-by: Steven Johnson <srj@google.com>

src/CodeGen_LLVM.cpp

@@ -1910,7 +1910,7 @@ Value *CodeGen_LLVM::codegen_buffer_pointer(const string &buffer, Halide::Type t
 
 Value *CodeGen_LLVM::codegen_buffer_pointer(Value *base_address, Halide::Type type, Expr index) {
     // Promote index to 64-bit on targets that use 64-bit pointers.
-    llvm::DataLayout d(module.get());
+    const llvm::DataLayout &d = module->getDataLayout();
     if (promote_indices() && d.getPointerSize() == 8) {
         index = promote_64(index);
     }
@@ -1951,7 +1951,7 @@ Value *CodeGen_LLVM::codegen_buffer_pointer(Value *base_address, Halide::Type ty
     }
 
     // Promote index to 64-bit on targets that use 64-bit pointers.
-    llvm::DataLayout d(module.get());
+    const llvm::DataLayout &d = module->getDataLayout();
     if (d.getPointerSize() == 8) {
         llvm::Type *index_type = index->getType();
         llvm::Type *desired_index_type = i64_t;
@@ -3286,7 +3286,7 @@ void CodeGen_LLVM::visit(const Call *op) {
     } else if (op->is_intrinsic(Call::undef)) {
         user_error << "undef not eliminated before code generation. Please report this as a Halide bug.\n";
     } else if (op->is_intrinsic(Call::size_of_halide_buffer_t)) {
-        llvm::DataLayout d(module.get());
+        const llvm::DataLayout &d = module->getDataLayout();
         value = ConstantInt::get(i32_t, (int)d.getTypeAllocSize(halide_buffer_t_type));
     } else if (op->is_intrinsic(Call::strict_float)) {
         IRBuilder<llvm::ConstantFolder, llvm::IRBuilderDefaultInserter>::FastMathFlagGuard guard(*builder);
@@ -4466,7 +4466,7 @@ Value *CodeGen_LLVM::create_alloca_at_entry(llvm::Type *t, int n, bool zero_init
     Value *size = ConstantInt::get(i32_t, n);
     AllocaInst *ptr = builder->CreateAlloca(t, size, name);
     int align = native_vector_bits() / 8;
-    llvm::DataLayout d(module.get());
+    const llvm::DataLayout &d = module->getDataLayout();
     int allocated_size = n * (int)d.getTypeAllocSize(t);
     if (t->isVectorTy() || n > 1) {
         ptr->setAlignment(llvm::Align(align));