[clang] [clang-repl] Add a interpreter-specific overload of operator new for C++ (PR #76218)

[Vassil Vassilev via cfe-commits]

vgvassilev wrote:

@vitalybuka, thank you!

I am trying to add a fix but I get `unsupported option '-fsanitize=hwaddress' for target 'x86_64-apple-darwin21.6.0'`. If you have a compatible platform, do you mind testing:

```diff
diff --git a/clang/unittests/Interpreter/InterpreterTest.cpp b/clang/unittests/Interpreter/InterpreterTest.cpp
index d6eb0684ba49..406a4871dff5 100644
--- a/clang/unittests/Interpreter/InterpreterTest.cpp
+++ b/clang/unittests/Interpreter/InterpreterTest.cpp
@@ -34,12 +34,6 @@ using namespace clang;
 #define CLANG_INTERPRETER_NO_SUPPORT_EXEC
 #endif
 
-#if LLVM_ADDRESS_SANITIZER_BUILD || LLVM_HWADDRESS_SANITIZER_BUILD
-#include <sanitizer/lsan_interface.h>
-#else
-extern "C" void __lsan_ignore_object(const void *p) {}
-#endif
-
 int Global = 42;
 // JIT reports symbol not found on Windows without the visibility attribute.
 REPL_EXTERNAL_VISIBILITY int getGlobal() { return Global; }
@@ -317,8 +311,9 @@ TEST(IncrementalProcessing, InstantiateTemplate) {
   auto fn =
       cantFail(Interp->getSymbolAddress(MangledName)).toPtr<TemplateSpecFn>();
   EXPECT_EQ(42, fn(NewA.getPtr()));
-  // FIXME: release the memory.
-  __lsan_ignore_object(NewA.getPtr());
+  // FIXME: Consider providing an option in clang::Value to take ownership of
+  // the memory created from the interpreter.
+  free(NewA.getPtr());
 }
 
 #ifdef CLANG_INTERPRETER_NO_SUPPORT_EXEC
```

I think that's going to work.

https://github.com/llvm/llvm-project/pull/76218