add a new --print-diagnostic-categories option, which causes the driver to
print out all of the category numbers with their description.  This is useful
for clients that want to map the numbers produced by 
--fdiagnostics-show-category=id to their human readable string form.  The
output is simple but utilitarian:

$ clang --print-diagnostic-categories
1,Format String
2,Something Else

This implements rdar://7928193


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@103080 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed