global trees

[Nathan Sidwell]

This reorders the common and c++ global	tree arrays.  It introduces a
module-specific High Water Mark, below which are the immutable slots
initialized at startup and beyond which	are the	lazily filled slots
(and a few immutables we need to locate by name lookup anyway).

         gcc/c-family/
         * c-common.h (enum c_tree_index): Reorder to place lazy fields
         after newly-added CTI_MODULE_HWM.
         gcc/cp/
         * cp-tree.h (enum cp_tree_index): Reorder to place lazy fields
         after newly-added CPTI_MODULE_HWM.

Pushing to trunk
-- 
Nathan Sidwell
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