For panic=unwind on Wasm targets, define __cpp_exception tag#1077

hoodmane wants to merge 1 commit intorust-lang:mainrust-lang/compiler-builtins:mainfrom

hoodmane:wasm-unwind-link-cpp-exceptionhoodmane/compiler-builtins:wasm-unwind-link-cpp-exceptionCopy head branch name to clipboard