fix Issue 15257 - __traits(compiles, .) with malformed inline asm sil…

[WalterBright]

…ently ends compilation

Previous PRs for this:

#5244
#6068

[dlang-bot]

Thanks for your pull request, @WalterBright!

Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	15257	normal	__traits(compiles, …) with malformed inline asm silently ends compilation

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#11597"

[thewilsonator]

Tests?

[WalterBright]

circleci fails with:

Makefile:208: recipe for target 'start_all_tests' failed
make: *** [start_all_tests] Hangup
Too long with no output (exceeded 10m0s): context deadline exceeded

which is quite useless as it runs a thousand tests in parallel and there's no clue which it is.

[WalterBright]

The timeout is happening on the autotester, too. But also with no clue in the log file.

[WalterBright]

Found the loop, will fix it tomorrow. The problem is the old method didn't require any error recovery, which I have to add.