* cpppch.c (reset_ht): Remove.
(cpp_read_state): Remove loop to reset hashtable identifiers.
* ggc-common.c (gt_pch_save): Add call to gt_pch_fixup_stringpool
after pch file is written.
* ggc.h (gt_pch_fixup_stringpool): Declare.
* stringpool.c (ht_copy_and_clear): Define. Callback. Copy
hashnode's value to another hashtable, then clear the original.
(saved_ident_hash): Define.
(gt_pch_save_stringpool): Create saved_ident_hash, use it to
store definitions in ident_hash, and clear ident_hash.
(gt_pch_fixup_stringpool): Define. Restore definitions from
saved_ident_hash to ident_hash, then destroy saved_ident_hash.
From-SVN: r65215
