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libcpp's label_text class wraps a text buffer, along with a flag to determine if it "owns" the buffer. The existing ctor exposed this directly, but I found it difficult to remember the sense of flag, so this patch hides the ctor, in favor of static member functions "borrow" and "take", to make the effect on ownership explicit in the name. gcc/c-family/ChangeLog: * c-format.c (range_label_for_format_type_mismatch::get_text): Replace label_text ctor called with true with label_text::take. gcc/c/ChangeLog: * c-objc-common.c (range_label_for_type_mismatch::get_text): Replace label_text ctor calls. gcc/cp/ChangeLog: * error.c (range_label_for_type_mismatch::get_text): Replace label_text ctor calls with label_text::borrow. gcc/ChangeLog: * gcc-rich-location.c (maybe_range_label_for_tree_type_mismatch::get_text): Replace label_text ctor call with label_text::borrow. * gcc-rich-location.h (text_range_label::get_text): Replace label_text ctor called with false with label_text::borrow. libcpp/ChangeLog: * include/line-map.h (label_text::label_text): Make private. (label_text::borrow): New. (label_text::take): New. (label_text::take_or_copy): New. From-SVN: r279153
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