glsl_type: Add a talloc-based new

And hook it up at the two sites it's called.

Note that with this change we still don't use glsl_type* objects as
talloc contexts, (see things like get_array_instance that accept both
a talloc 'ctx' as well as a glsl_type*). The reason for this is that
the code is still using many instance of glsl_type objects not created
with new.

This closes 3 leaks in the glsl-orangebook-ch06-bump.frag test:

	total heap usage: 55,623 allocs, 55,618

Leaving only 5 leaks to go.

1 files changed, 1 insertions, 1 deletions

diff --git a/glsl_types.cpp b/glsl_types.cpp
index d1b9dc6412..bef267fa6b 100644
--- a/glsl_types.cpp
+++ b/glsl_types.cpp
@@ -702,7 +702,7 @@ glsl_type::get_array_instance(void *ctx, const glsl_type *base,
 
    const glsl_type *t = (glsl_type *) hash_table_find(array_types, & key);
    if (t == NULL) {
-      t = new glsl_type(ctx, base, array_size);
+      t = new(ctx) glsl_type(ctx, base, array_size);
 
       hash_table_insert(array_types, (void *) t, t);
    }