[WebAssembly] Support Leak Sanitizer on Emscripten
[WebAssembly] Support Leak Sanitizer on Emscripten

Summary:
LSan is currently being ported to Emscripten and mostly works.

Enabling the support in upstream would simplify testing.

Patch by Guanzhong Chen.

Reviewers: tlively, aheejin

Reviewed By: aheejin

Subscribers: dschuff, sbc100, jgravelle-google, sunfish, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D62830

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@362667 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang