[WebAssembly] Remove duplicated RTLIB names
Remove the tight coupling between llvm/CodeGenRuntimeLibcalls.def and
the table of supported singatures for wasm. This will allow adding new libcalls
without changing wasm's signature table.
Also, some cleanup:
Use ManagedStatics instead of const tables to avoid memory/binary bloat.
Use a StringMap instead of a linear search for name lookup.
Differential Revision: https://reviews.llvm.org/D35592
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@322802
91177308-0d34-0410-b5e6-
96231b3b80d8
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