[WebAssembly] Support CFI for WebAssembly target
Summary: This patch implements CFI for WebAssembly. It modifies the
LowerTypeTest pass to pre-assign table indexes to functions that are
called indirectly, and lowers type checks to test against the
appropriate table indexes. It also modifies the WebAssembly backend to
support a special ".indidx" assembly directive that propagates the table
index assignments out to the linker.
Patch by Dominic Chen
Differential Revision: https://reviews.llvm.org/D21768
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277398
91177308-0d34-0410-b5e6-
96231b3b80d8
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