[llvm-rc] Serialize STRINGTABLE statements to .res file.

[llvm-rc] Serialize STRINGTABLE statements to .res file.

This allows llvm-rc to serialize STRINGTABLE resources.

These are output in an unusual way: we locate them at the end of the
file, and strings are merged into bundles of max 16 strings, depending
on their IDs, language, and characteristics.

Ref: msdn.microsoft.com/en-us/library/windows/desktop/aa381050.aspx

Patch by: Marek Sokolowski
Differential Revision: https://reviews.llvm.org/D38420

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315112 91177308-0d34-0410-b5e6-96231b3b80d8