[PATCH] D54874: [WebAssembly] Make Signature as an optional property for every type

[Heejin Ahn via Phabricator via llvm-commits]

aheejin created this revision.
aheejin added reviewers: dschuff, sbc100.
Herald added subscribers: llvm-commits, dexonsmith, steven_wu, sunfish, jgravelle-google, mehdi_amini.

This makes `Signature` as an optional type that any type can have its
value set if necessary. The motivation is, now other symbols, such as
event symbols, can have signatures.


Repository:
  rLLD LLVM Linker

https://reviews.llvm.org/D54874

Files:
  wasm/Driver.cpp
  wasm/InputFiles.cpp
  wasm/LTO.cpp
  wasm/SymbolTable.cpp
  wasm/Symbols.h
  wasm/Writer.cpp

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