Refactored the expression parser so that the IR
and the JITted code are managed by a standalone
class that handles memory management itself.

I have removed RecordingMemoryManager and
ProcessDataAllocator, which filled similar roles
and had confusing ownership, with a common class
called IRExecutionUnit.  The IRExecutionUnit
manages all allocations ever made for an expression
and frees them when it goes away.  It also contains
the code generator and can vend the Module for an
expression to other clases.

The end goal here is to make the output of the
expression parser re-usable; that is, to avoid
re-parsing when re-parsing isn't necessary.

I've also cleaned up some code and used weak pointers
in more places.  Please let me know if you see any
leaks; I checked myself as well but I might have
missed a case.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@177364 91177308-0d34-0410-b5e6-96231b3b80d8
<rdar://problem/13443931>

Fixed a crasher in the SourceManager where it wasn't checking the m_target member variable for NULL.

In doing this fix, I hardened this class to have weak pointers to the debugger and target in case they do go away. I also changed SBSourceManager to hold onto weak pointers to the debugger and target so they don't keep objects alive by holding a strong reference to them.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@177365 91177308-0d34-0410-b5e6-96231b3b80d8
This checkin removes the last Cocoa formatters that were implemented in Python and reimplements them in C++. The Python Cocoa formatters are not shipped as part of LLDB anymore, but still exist in the source repository for user reference. Python formatters still exist for STL classes and users can still define their own Python formatters

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@177366 91177308-0d34-0410-b5e6-96231b3b80d8