Commits on Apr 12, 2020

1. Add cppdemangle in druntime …

   Having a C++ symbol demangler is very useful, with this it will
   be possible to implement the C++ symbol demangle in the stacktrace.
   
   The demangling is done in Posix platform by function __cxa_demangle
   presents in Itanium C++ ABI (https://itanium-cxx-abi.github.io/cxx-abi/abi.html#demangler).
   
   Itanium C++ ABI is used practically in all modern C++ compilers on Posix,
   however old compilers (like GCC < 3.0) used a different name mangling,
   this is not a problem because DMD in fact only supports Itanium C++ ABI on Posix.
   
   For Windows instead the implementation it is provided by the UnDecorateSymbolName
   function present in the Debug Help Library.
   (https://docs.microsoft.com/en-us/windows/win32/api/dbghelp/nf-dbghelp-undecoratesymbolname)
   
   Signed-off-by: Ernesto Castellotti <mail@ernestocastellotti.it>

   Ernesto Castellotti committed Apr 12, 2020
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2. Enable demangling of C++ symbols in the stacktrace …

   This allows you to view demangled and pretty printed C++ symbols
   in the stacktrace.
   Is especially useful considering that D is getting more and more support for C++.
   
   Now the C++ symbols in the stacktrace will be printed like this:
   	test.d:7 [C++] Test<int>::SomeName(int, long, int) [0x55711efee36f]
           test.d:18 [C++] testcpp() [0x557228e17978]
   
   Signed-off-by: Ernesto Castellotti <mail@ernestocastellotti.it>

   Ernesto Castellotti committed Apr 12, 2020
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