[Coverage] Refactor coverage mapping reader code

[Coverage] Refactor coverage mapping reader code

(Resubmit after fixing a typo that breaks test on big endian
 machines)

In this refactoring, member functions are introduced to access
CovMap header/func record members and hide layout details. This
will enable further code restructuring to support reading multiple
versions of coverage mapping data with shared/templatized code.
(When coveremap format version changes, backward compatibtility
should be preserved).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257571 91177308-0d34-0410-b5e6-96231b3b80d8