i965/fs: Split the GLSL IR -> FS LIR visitor to brw_fs_visitor.cpp.

We now have:
brw_fs.cpp handles calling out to everything and optimization.
brw_fs_visitor.cpp handles translating to our LIR.
brw_fs_emit.cpp handles emitting from our LIR to native code.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/Makefile

@@ -117,6 +117,7 @@ CXX_SOURCES = \
 	brw_cubemap_normalize.cpp \
 	brw_fs.cpp \
 	brw_fs_emit.cpp \
+	brw_fs_visitor.cpp \
 	brw_fs_channel_expressions.cpp \
 	brw_fs_reg_allocate.cpp \
 	brw_fs_schedule_instructions.cpp \

src/mesa/drivers/dri/i965/brw_fs.h

@@ -466,6 +466,8 @@ public:
       return emit(fs_inst(opcode, dst, src0, src1, src2));
    }
 
+   int type_size(const struct glsl_type *type);
+
    bool run();
    void setup_paramvalues_refs();
    void assign_curb_setup();