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[WebAssembly] Honor WASM_SYMBOL_EXPORT symbol flag

Description

[WebAssembly] Honor WASM_SYMBOL_EXPORT symbol flag

This flag means that symbol should be exported in the final binary.

The reason for this change is to allow source level annotations to
trigger a given symbol to be exported:
https://github.com/emscripten-core/emscripten/issues/7702

Differential Revision: https://reviews.llvm.org/D57869

Details

Committed
sbcFeb 6 2019, 5:53 PM
Differential Revision
D57869: [WebAssembly] Honor WASM_SYMBOL_EXPORT symbol flag
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