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

Change interface to Path class:
readable -> canRead
writable -> canWrite
executable -> canExecute

More (incremental) changes coming to close 495.

llvm-svn: 22345

configure seems to find it on Cygwin but linking against it fails.

llvm-svn: 22189

llvm-svn: 22081

llvm-svn: 21704

llvm-svn: 21453

llvm-svn: 21422

methods that were recently added to the interface.

llvm-svn: 21401

Standardize the error messages to be in "path: what failed: why" format.
Also attempt to use the correct errno to ThrowErrno in situations where
the errno value is erased by subsequent system calls.

llvm-svn: 21385

Allow the ThrowErrno function to optionally accept an error number
parameter so that callers can specify the error number to be used.

llvm-svn: 21384

result in returning executable files that won't be runnable.

llvm-svn: 21378

Patch by Markus Oberhumer.

llvm-svn: 21377

Thanks to Markus Oberhumer for the patch!

llvm-svn: 21370

llvm-svn: 21216

llvm-svn: 20397

llvm-svn: 20256

llvm-svn: 20255

llvm-svn: 20243

llvm-svn: 20237

llvm-svn: 20208

llvm-svn: 20184

llvm-svn: 20170

This causes garbage to be printed out after error messages.

llvm-svn: 20165

llvm-svn: 19852

llvm-svn: 19746

llvm-svn: 19605

llvm-svn: 19563

llvm-svn: 19545

llvm-svn: 19544

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

on 64-bit Windows.

llvm-svn: 19393

llvm-svn: 19254

console or not.

llvm-svn: 19236

console or not.

llvm-svn: 19233

llvm-svn: 19203

llvm-svn: 19202

llvm-svn: 19201

llvm-svn: 19199

llvm-svn: 19198

llvm-svn: 19190