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[WebAssembly] Support imports from custom module names

Authored by sbc100 on Jan 31 2019, 6:29 PM.

Description

[WebAssembly] Support imports from custom module names

Fixes: https://bugs.llvm.org/show_bug.cgi?id=37168

This is only a first pass at supporting these custom import
modules. In the long run we most likely want to treat these
kinds of symbols very differently. For example, it should not
be possible to resolve such as symbol at static link type.

Differential Revision: https://reviews.llvm.org/D45796

llvm-svn: 352828