Revert "[WebAssembly] LSDA info generation"

This reverts commit r344575.
Newly introduced test eh-lsda.ll.test fails with use-after-free under
ASAN build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344639 91177308-0d34-0410-b5e6-96231b3b80d8
20 files changed