Raise basic build cache size even more. #78650
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Summary
None
Purpose of change
Basic build still not getting 100% cache hit rate, so its hitting 20-30 minute build times instead of scant minutes.
Describe the solution
Raise the cache up to 5G. Raise the transient cache limit to 10G to avoid spurious evictions.
Describe alternatives you've considered
Testing
Spun up an Ubuntu 20.04 VM, installed clang-10 on it, did a build like the basic build does. It makes a ccache about 4.3GB large. Verified that setting a 5G limit does not cause any evictions.
Additional context