Alex Crichton 8edcda4095
Update threads-xform for current nightly (#2183)
This commit updates the threads transformation for LLVM 10 where LLD has
has breaking changes from LLVM 9. While previously the support here
attempted to straddle multiple LLVM styles this is now removed in favor
of simply supporting LLVM 10's style of output. This means that
wasm-bindgen will only be compatible with recent nightlies and forward.

The major change here is that the `__wasm_init_memory` function is
automatically called by the `start` function. We handle that by placing
the previous `start` function first, before stack/tls allocation. Other
changes are to delete all the old code from pre-llvm-9.

Closes #2175
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