Implemented resinfo opcode.
Added sobel filter test.

Uses resinfo and texelFetch.
Set integer flag on texelFetch coordinates.
Move the control flow graph into the context.
Add continuec support to the CFG.
Renamed a function
Fixed a problem with comparison opcodes.

SM4+
Set all bits to 1 if result is true.
PreSM4
1.0f if result is true.

Previously the result was integer 1 when true.
Merge branch 'master' into ControlFlowGraph