MCJIT-remote: __main should be resolved in child context.

- Mark tests as XFAIL:cygming in test/ExecutionEngine/MCJIT/remote.
    Rather to suppress them, I'd like to leave them running as XFAIL.
  - Revert r193472. RecordMemoryManager no longer resolves __main on cygming.

There are a couple of issues.

  - X86 Codegen emits "call __main" in @main for targeting cygming.
    It is useless in JIT. FYI, tests are passing when emitting __main is disabled.
  - Current remote JIT does not resolve any symbols in child context.

FIXME: __main should be disabled, or remote JIT should resolve __main.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193498 91177308-0d34-0410-b5e6-96231b3b80d8

tools/lli/RemoteMemoryManager.cpp

@@ -204,19 +204,3 @@ uint8_t *RemoteMemoryManager::allocateGlobal(uintptr_t Size, unsigned Alignment)
 void RemoteMemoryManager::deallocateFunctionBody(void *Body) {
   llvm_unreachable("Unexpected!");
 }
-
-static int jit_noop() {
-  return 0;
-}
-
-uint64_t RemoteMemoryManager::getSymbolAddress(const std::string &Name) {
-  // We should not invoke parent's ctors/dtors from generated main()!
-  // On Mingw and Cygwin, the symbol __main is resolved to
-  // callee's(eg. tools/lli) one, to invoke wrong duplicated ctors
-  // (and register wrong callee's dtors with atexit(3)).
-  // We expect ExecutionEngine::runStaticConstructorsDestructors()
-  // is called before ExecutionEngine::runFunctionAsMain() is called.
-  if (Name == "__main") return (uintptr_t)&jit_noop;
-
-  return 0;
-}