Change DWARFCallFrameInfo from using a vector of AddressRanges to
track the EH FDEs for the functions in a module to using a
RangeDataVector, a more light-weight data structure that only refers
to File addresses.  Makes the initial FDE scan about 3x faster, uses
less memory.
<rdar://problem/13465650> 


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@177585 91177308-0d34-0410-b5e6-96231b3b80d8