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

lib/MC/MCObjectFileInfo.cpp

@@ -743,12 +743,6 @@ void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) {
   DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata());
   DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata());
 
-  // Wasm use data section for LSDA.
-  // TODO Consider putting each function's exception table in a separate
-  // section, as in -function-sections, to facilitate lld's --gc-section.
-  LSDASection = Ctx->getWasmSection(".rodata.gcc_except_table",
-                                    SectionKind::getReadOnlyWithRel());
-
   // TODO: Define more sections.
 }