Add known_gcc_test_failures.txt
Add known_gcc_test_failures.txt

For now none of the failures are classified.

WebAssembly/wabt,WebAssembly/wabt,WebAssembly/sexpr-wasm-prototype,citisolo/wabt,WebAssembly/sexpr-wasm-prototype,citisolo/wabt,WebAssembly/wabt,WebAssembly/sexpr-wasm-prototype,WebAssembly/sexpr-wasm-prototype,citisolo/wabt,citisolo/wabt,WebAssembly/sexpr-wasm-prototype,citisolo/wabt,WebAssembly/wabt,citisolo/wabt,WebAssembly/wabt,WebAssembly/sexpr-wasm-prototype