[PATCH] Avoid unnecessary inclusion of <stdexcept> header

[Jonathan Wakely]

On 06/06/19 16:38 +0100, Jonathan Wakely wrote:
>This can greatly reduce the amount of preprocessed code that is included
>by other headers, because <stdexcept> depends on <string> which is huge.
>
>	* include/std/array: Do not include <stdexcept>.
>	* include/std/optional: Include <exception> and
>	<bits/exception_defines.h> instead of <stdexcept>.
>
>Preprocessed line counts for C++17 mode:
>
>      <tuple> <memory> <map>
>Before   25774    32453 31616
>After     9925    23194 19062
>
>Tested x86_64-linux, committed to trunk.
>
>Once we have a gcc-10/porting_to.html page I'll note this change
>there, because code relying on std::string and std::allocator being
>defined by transitive includes will need to include the right headers.

After this change some tests fail without PCH, because they weren't
including what they use.

Tested x86_64-linux, committed to trunk.

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