cmd/go: compiler stdout/stderr should be cached #22587
Description
We cache the .a written by the compiler but not its output. This means that if you run -gcflags=-m twice, you only get to see the diagnostics once. We should fix that.
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We cache the .a written by the compiler but not its output. This means that if you run -gcflags=-m twice, you only get to see the diagnostics once. We should fix that.