this handling to work properly for modifying stub functions, relocations
back to entry points after JIT compilation, etc..

llvm-svn: 57013

Preliminary support for systems which require changing JIT memory regions privilege from read / write to read / executable.

llvm-svn: 56303

llvm-svn: 56244

llvm-svn: 50659

llvm-svn: 48743

llvm-svn: 48677

llvm-svn: 48676

llvm-svn: 45418

Final removal of exceptions from lib/System and adjustment of users to
accommodate.

llvm-svn: 29846

llvm-svn: 29058

llvm-svn: 22554

llvm-svn: 21704

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
* Consolidate implementation from operating system specific directory.

llvm-svn: 19157

llvm-svn: 16291

"Program" operating system concept (find and execute programs).

llvm-svn: 16084

note individually but these essence of it is to not derive from
std::string, clarify the interface, and provide better documentation.
There is now also (untested) implementations for AIX, Darwin, and SunOS.

llvm-svn: 16078

llvm-svn: 16048