mesa: change _mesa_find_free_register() to find multiple free regs

Before, _mesa_find_free_register() would scan the given shader to
find a free/unused register of the given type.  But subsequent calls
would return the same register again.  This caused a failure in the
_mesa_remove_output_reads() function which sometimes needs several
free temps.

Now use a new function which build a vector of 'used' flags and another
function which searches that vector for an unused register starting at
a position that's incremented for each call.

Fixes fd.o bug 26317.  Note that a regression test for this has been
added to the glean/glsl1 test.

(cherry picked from commit e0d01c9d7f46ccd531f8dd1a04c5ac067200ef1e)

src/mesa/shader/program.h

@@ -119,8 +119,14 @@ _mesa_combine_programs(GLcontext *ctx,
                        const struct gl_program *progA,
                        const struct gl_program *progB);
 
+extern void
+_mesa_find_used_registers(const struct gl_program *prog,
+                          gl_register_file file,
+                          GLboolean used[], GLuint usedSize);
+
 extern GLint
-_mesa_find_free_register(const struct gl_program *prog, GLuint regFile);
+_mesa_find_free_register(const GLboolean used[],
+                         GLuint maxRegs, GLuint firstReg);
 
 extern void
 _mesa_postprocess_program(GLcontext *ctx, struct gl_program *prog);