Using a pattern similar to that of YamlIO, this allows
us to have a single codepath for translating codeview
records to and from serialized byte streams. The
current patch only hooks this up to the reading of
CodeView type records. A subsequent patch will hook
it up for writing of CodeView type records, and then a
third patch will hook up the reading and writing of
CodeView symbols.
Differential Revision: https://reviews.llvm.org/D26040
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@285836 91177308-0d34-0410-b5e6-96231b3b80d8
