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[WebAssembly] Handle weak undefined functions with a synthetic stub

Authored by ncw on Mar 9 2018, 9:06 AM.

Description

[WebAssembly] Handle weak undefined functions with a synthetic stub

This error case is described in Linking.md. The operand for call requires
generation of a synthetic stub.

Differential Revision: https://reviews.llvm.org/D44028

llvm-svn: 327151

Details