i965: Expose brw_reg_from_fs_reg() to other files.

This will be useful for Broadwell code as well.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
diff --git a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
index d67c4e4..63ac530 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
@@ -989,7 +989,7 @@
    }
 }
 
-static struct brw_reg
+struct brw_reg
 brw_reg_from_fs_reg(fs_reg *reg)
 {
    struct brw_reg brw_reg;