Get rid of the difference between file paths and directory paths. The Path
class now simply stores a path that can refer to either a file or a
directory. This required various changes in the implementation and interface
of the class with the corresponding impact to its users. Doxygen comments were
also updated to reflect these changes. Interface changes are:

appendDirectory -> appendComponent
appendFile -> appendComponent
elideDirectory -> eraseComponent
elideFile -> eraseComponent
elideSuffix -> eraseSuffix
renameFile -> rename
setDirectory -> set
setFile -> set

Changes pass Dejagnu and llvm-test/SingleSource tests.

llvm-svn: 22349

llvm-svn: 21704

llvm-svn: 21453

gdb debugger doesn't get confused on which file it is reading (the one in
lib/System or the one in lib/System/{Win32,Unix})

llvm-svn: 19426

* Ensure #includes are wrapped with appropriate HAVE_ guards

llvm-svn: 19156

llvm-svn: 18785

llvm-svn: 17781

llvm-svn: 17498

of "Signals" (cleanup after fatal errors).

llvm-svn: 16085

llvm-svn: 15496

but not right now.

llvm-svn: 13811

llvm-svn: 11690

in a signal handler, allocating memory or doing other unsafe things is bad,
which means we should do it in a different process.

llvm-svn: 11689

llvm-svn: 11658

call breaks on sparcs

llvm-svn: 11635

llvm-svn: 11631

the symbols are not demangled.

llvm-svn: 11620

llvm-svn: 10464

llvm-svn: 9903

Header files will be on the way.

llvm-svn: 9298

llvm-svn: 8559

llvm-svn: 7480

system.

llvm-svn: 7014

llvm-svn: 6351

llvm-svn: 6305

ISSUE: Linux doesn't have any steenking SIGEMT signal, as referred to in
lib/Support/Signals.cpp.

ACTION: Wrap the use with a #ifdef SIGEMT / #endif.
llvm-svn: 3700

llvm-svn: 2791

llvm-svn: 2302