[6.2] [GH:#9304] Explicit source file declaration in Target's sources causes a performance degradation in TargetSourcesBuilder #9506
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Cherry-pick from:
#9385
Avoid expensive string array operations when performing target source evaluation.
Local timings for target source evaluation of protoc before and after:
Before: 'swift-protobuf': TargetSourcesBuilder.run() for target 'protoc' took 11.544s
After: 'swift-protobuf': TargetSourcesBuilder.run() for target 'protoc' took 0.190s
CPU cycles for full build of swift-protobuf:
Before: 33.43 G
After: 5.72 G
Motivation:
Fixes: #9304