f4016e2bf5
compiletest: Allow multiple `//@ run-flags:` headers While working on some tests, I was annoyed to find that multiple `// `@run-flags:`` headers do not combine with each other (as `//@ compile-flags:` headers do), and instead all but one are silently discarded. This makes it impossible to split long flag lists into multiple lines. Fortunately it's easy to just recycle the existing logic from the other command-line-flags headers.
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