Hamish Knight cc465937a2 [IRGen] Emit name data for unused coverage counters ...

Previously, if all the coverage counters for a
given SIL function were optimized out, we would
have dropped the coverage map on the floor,
leading to inaccurate coverage reports in `-O`.
However LLVM allows us to emit the name data for
the coverage maps separately by defining an
`__llvm_coverage_names` global with the name data,
which is picked up by its instrumentation lowering
pass. Use this to continue to emit coverage maps
for functions that do not get emitted.

rdar://99813754

2022-09-16 15:47:16 +01:00

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