Instantiate a single source highlighter
It occurred to me that there's no reason to make a new source
highlighter each time gdb needs to highlight some source code.
Instead, a single one can be created and then simply reused each time.
This patch implements this idea. Tested on x86-64 Fedora 29.
gdb/ChangeLog
2019-06-19 Tom Tromey <tromey@adacore.com>
* source-cache.c (highlighter): New global.
(source_cache::get_source_lines): Create a highlighter on demand.
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