Revert r206989, "Mark llvm/test/BugPoint/compile-custom.ll as XFAIL:vg_leak." It has been fixed since r207265.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207355 91177308-0d34-0410-b5e6-96231b3b80d8
Add the default constructor DwarfAccelTable::DataArray() to initialize (MCSymbol*)StrSym explicitly.

It will fix crash in codegen on msvc x64.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207356 91177308-0d34-0410-b5e6-96231b3b80d8