[WebAssembly] Treat __cxa_end_catch not longjmpable in Emscripten SjLj

In D117610 we treated `__cxa_end_catch` longjmpable even though it was
not to make unwind destination relationships correct. But we only need
to do this in Wasm SjLj, and doing this in Emscripten SjLj does not make
the code incorrect but add unnecessary invokes. This CL treats
`__cxa_end_catch` longjmpable only in Wasm SjLj.

Reviewed By: dschuff

Differential Revision: https://reviews.llvm.org/D117943