[Ada] Prevent caching of non-text symbols for symbolic tracebacks

[Pierre-Marie de Rodat]

We now only have the executable code section boundaries at hand,
so can only infer offsets for symbols within those boundaries.

Symbols outside of this region are non-text symbols, pointless for
traceback symbolization anyway.

Tested on x86_64-pc-linux-gnu, committed on trunk

2018-05-22  Olivier Hainque  <hainque@adacore.com>

gcc/ada/

	* libgnat/s-dwalin.adb (Enable_Cache): Skip symbols outside of the
	executable code section boundaries.
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