[libc-commits] [libc] [libc] Add aligned_alloc (PR #96586)

[Nick Desaulniers via libc-commits]

================
@@ -567,3 +569,201 @@ TEST_FOR_EACH_BLOCK_TYPE(CanGetConstBlockFromUsableSpace) {
   const BlockType *block2 = BlockType::from_usable_space(ptr);
   EXPECT_EQ(block1, block2);
 }
+
+TEST_FOR_EACH_BLOCK_TYPE(CanAllocate) {
+  constexpr size_t kN = 1024;
+
+  // Ensure we can allocate everything up to the block size within this block.
+  for (size_t i = 0; i < kN - BlockType::BLOCK_OVERHEAD; ++i) {
+    alignas(BlockType::ALIGNMENT) array<byte, kN> bytes{};
+    auto result = BlockType::init(bytes);
+    ASSERT_TRUE(result.has_value());
+    BlockType *block = *result;
+
+    constexpr size_t kAlign = 1; // Effectively ignores alignmenr.
----------------
nickdesaulniers wrote:

```suggestion
    constexpr size_t kAlign = 1; // Effectively ignores alignment.
```

https://github.com/llvm/llvm-project/pull/96586