Added a batch script to package an Windows LLVM build for CI.

build/ci/package_llvm_windows.bat

@@ -0,0 +1,26 @@
+rmdir /s /q out
+mkdir out
+mkdir out\tools\clang
+mkdir out\tools\clang\lib\CodeGen
+mkdir out\tools\clang\lib\Driver
+mkdir out\build\
+mkdir out\build\tools\clang\
+
+set rbcopy=%systemroot%\System32\robocopy /NDL /NFL /NJH /NJS
+set dircopy=%rbcopy% /E
+
+%dircopy% include\ out\include
+%dircopy% build\include\ out\build\include
+%dircopy% build\RelWithDebInfo\lib out\build\RelWithDebInfo\lib
+
+%dircopy% tools\clang\include\ out\tools\clang\include
+copy /Y tools\clang\lib\CodeGen\*.h out\tools\clang\lib\CodeGen >nul
+copy /Y tools\clang\lib\Driver\*.h out\tools\clang\lib\Driver >nul
+%dircopy% build\tools\clang\include\ out\build\tools\clang\include
+
+del out\build\RelWithDebInfo\lib\LLVM*ObjCARCOpts*.lib
+del out\build\RelWithDebInfo\lib\clang*ARC*.lib
+del out\build\RelWithDebInfo\lib\clang*Matchers*.lib
+del out\build\RelWithDebInfo\lib\clang*Rewrite*.lib
+del out\build\RelWithDebInfo\lib\clang*StaticAnalyzer*.lib
+del out\build\RelWithDebInfo\lib\clang*Tooling*.lib