[clang][Sema] Tests for GH41441

I've borrowed size-calculation test from PR89036 and added another test, which PR89036 fails on.

Author: awson

clang/test/SemaCXX/GH41441.cpp

@@ -0,0 +1,46 @@
+// RUN: %clang --target=x86_64-pc-linux -S -fno-discard-value-names -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 %s -fsyntax-only -verify
+
+namespace std {
+  using size_t = decltype(sizeof(int));
+};
+void* operator new[](std::size_t, void*) noexcept;
+
+// CHECK: call void @llvm.memset.p0.i64(ptr align 1 %x, i8 0, i64 8, i1 false)
+// CHECK: call void @llvm.memset.p0.i64(ptr align 16 %x, i8 0, i64 32, i1 false)
+template <typename TYPE>
+void f()
+{
+    typedef TYPE TArray[8];
+
+    TArray x;
+    new(&x) TArray();
+}
+
+template <typename T>
+void f1() {
+  int (*x)[1] = new int[1][1];
+}
+template void f1<char>();
+void f2() {
+  int (*x)[1] = new int[1][1];
+}
+
+int main()
+{
+    f<char>();
+    f<int>();
+}
+
+// expected-no-diagnostics
+template <typename T> struct unique_ptr {unique_ptr(T* p){}};
+
+template <typename T>
+unique_ptr<T> make_unique(unsigned long long n) {
+  return unique_ptr<T>(new T[n]());
+}
+
+auto boro(int n){
+	typedef double HistoryBuffer[4];
+	return make_unique<HistoryBuffer>(n);
+}