Milestone 0.1.2

Support for AMD OpenCL 2.0 implementation (program binaries and CLRXWrapper). List of changes:

• AMD OpenCL 2.0 support
• 64-bit Gallium binary format support
• support for new closed Linux and Windows drivers
• new samples
• documentation for OpenCL 2.0 support (includes ABI)
• documentation for GCN ISA FLAT encoding
• lit() specifier to distinguish literal and inline constant
• alternate macro syntax
• correct counting registers for automatic configuration
• fixed handling of conditionals and macro pseudo-ops
• disassembler can dump configuration in user-friendly form