SysV ABI for i386 Architecture

Summary:
  - Capability to force return user specified values
    from inside of a function on lldb command terminal

  - Support for Integral, Pointer and Floating Point values

Signed-off-by: Abhishek Aggarwal <abhishek.a.aggarwal@intel.com>

Reviewers: jingham, clayborg

Subscribers: tberghammer

Differential Revision: http://reviews.llvm.org/D12595

llvm-svn: 246841