glsl: Add tracking for elements of an array-of-arrays that have been accessed

If there's a better way to provide access to ir_array_refcount_entry
private members to the test functions, I am very interested to know
about it.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Cc: Francisco Jerez <currojerez@riseup.net>
Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/compiler/glsl/ir_array_refcount.cpp

@@ -56,7 +56,15 @@ ir_array_refcount_visitor::~ir_array_refcount_visitor()
 ir_array_refcount_entry::ir_array_refcount_entry(ir_variable *var)
    : var(var), is_referenced(false)
 {
-   /* empty */
+   num_bits = MAX2(1, var->type->arrays_of_arrays_size());
+   bits = new BITSET_WORD[BITSET_WORDS(num_bits)];
+   memset(bits, 0, BITSET_WORDS(num_bits) * sizeof(bits[0]));
+}
+
+
+ir_array_refcount_entry::~ir_array_refcount_entry()
+{
+   delete [] bits;
 }