[PATCH] D112374: [clang] Implement ElaboratedType sugaring for types written bare

[Matheus Izvekov via Phabricator via cfe-commits]

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In D112374#3535949 <https://reviews.llvm.org/D112374#3535949>, @rsmith wrote:

> I've not looked at the test changes in any detail; please let me know if there's anything in there that deserves special attention.

The new (since last rebase) change in `clang-tools-extra/test/clang-tidy/checkers/bugprone/shared-ptr-array-mismatch.cpp` might be worth a look.
I think this is a fix, and the pre-existing code missed it by pure accident.

I am not sure there are any scenarios where we might want to avoid suggesting this fix in dependent contexts, if there were we should throw a FIXME in there.

There are a couple of minor significant changes since the last diff, might be worth an extra look, but mainly some minor conflicts with the introduction of UsingType by @sammccall .



================
Comment at: llvm/include/llvm/Support/SizeOf.h:20-23
+/// A sizeof operator stand-in which supports `sizeof(void) == 0`.
+///
+template <class T> struct SizeOf { static constexpr size_t value = sizeof(T); };
+template <> struct SizeOf<void> { static constexpr size_t value = 0; };
----------------
rsmith wrote:
> I think it's too surprising to call this simply `SizeOf`, especially given that under https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0146r1.html we might eventually see C++ defining `sizeof(void)` as some non-zero value.
The author merely suggests the two issues are independent :)

If this paper ever gets followed up on, leaving `sizeof(void) != 0` would be a riot!


================
Comment at: llvm/include/llvm/Support/SizeOf.h:25-32
+/// An alignof operator stand-in which supports `alignof(void) == 1`.
+///
+template <class T> struct AlignOf {
+  static constexpr size_t value = alignof(T);
+};
+template <> struct AlignOf<void> { static constexpr size_t value = 1; };
+
----------------
rsmith wrote:
> There's already a (different!) `llvm::AlignOf` in `llvm/Support/AlignOf.h`.
Well that is the one which is surprising to simply call `AlignOf` =)


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https://reviews.llvm.org/D112374