[WebAssembly] Fix list of relocations with addends in lld

Summary:
The list of relocations with addend in lld was missing `R_WASM_MEMORY_ADDR_REL_SLEB`,
causing `wasm-ld` to generate corrupted output. This fixes that problem and while
we're at it pulls the list of such relocations into the Wasm.h header, to avoid
duplicating it in multiple places.

Reviewers: sbc100
Differential Revision: https://reviews.llvm.org/D63696

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364367 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed