Thomas Lively 1c5a3c4d38 [WebAssembly] Make SjLj lowering globals thread-local ...

Emscripten's longjump and exception mechanism depends on two global variables,
`__THREW__` and `__threwValue`, which are changed to be defined as thread-local
in https://github.com/emscripten-core/emscripten/pull/12056. This patch updates
the corresponding code in the WebAssembly backend to properly declare these
globals as thread-local as well.

Differential Revision: https://reviews.llvm.org/D88262

2020-09-24 14:56:19 -07:00

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