[fidl][cpp] Simplifying code to destruct in unions

When two types named the same need to be destructed, the expression
`var.~Type()` is ambiguous and the compiler errors out. To avoid this
problem altogether, we are switching the generation to
`var.~decltype(var)`. This in turns reduces the need to track destructor
types in the fidlgen cpp IR code, which can be simplified to only track
whether explicit destruction is needed (or not).

Test: goldens, and other FIDL tests
Change-Id: I2289385af60b4aa87f83c73c45a4bbb1fd8f389a
9 files changed
tree: 429e7f6f74cf7bd825fed0fb8e3c63618546369d
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. garnet/
  7. peridot/
  8. products/
  9. scripts/
  10. sdk/
  11. src/
  12. third_party/
  13. tools/
  14. zircon/
  15. .clang-format
  16. .clang-tidy
  17. .dir-locals.el
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .style.yapf
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. README.md
  30. rustfmt.toml
README.md

Fuchsia

Pink + Purple == Fuchsia (a new operating system)

What is Fuchsia?

Fuchsia is a modular, capability-based operating system. Fuchsia runs on modern 64-bit Intel and ARM processors.

Fuchsia is an open source project with a code of conduct that we expect everyone who interacts with the project to respect.

How can I build and run Fuchsia?

See Getting Started.

Where can I learn more about Fuchsia?

See fuchsia.dev.