[llvm-profgen] On-demand track optimized-away inlinees for preinliner.
Tracking optimized-away inlinees based on all probes in a binary is expansive in terms of memory usage I'm making the tracking on-demand based on profiled functions only. This saves about 10% memory overall for a medium-sized benchmark. Before: note: After parsePerfTraces note: Thu Jan 27 18:42:09 2022 note: VM: 8.68 GB RSS: 8.39 GB note: After computeSizeForProfiledFunctions note: Thu Jan 27 18:42:41 2022 note: **VM: 10.63 GB RSS: 10.20 GB** note: After generateProbeBasedProfile note: Thu Jan 27 18:45:49 2022 note: VM: 25.00 GB RSS: 24.95 GB note: After postProcessProfiles note: Thu Jan 27 18:49:29 2022 note: VM: 26.34 GB RSS: 26.27 GB After: note: After parsePerfTraces note: Fri Jan 28 12:04:49 2022 note: VM: 8.68 GB RSS: 7.65 GB note: After computeSizeForProfiledFunctions note: Fri Jan 28 12:05:26 2022 note: **VM: 8.68 GB RSS: 8.42 GB** note: After generateProbeBasedProfile note: Fri Jan 28 12:08:03 2022 note: VM: 22.93 GB RSS: 22.89 GB note: After postProcessProfiles note: Fri Jan 28 12:11:30 2022 note: VM: 24.27 GB RSS: 24.22 GB This should be a no-diff change in terms of profile quality. Reviewed By: wenlei Differential Revision: https://reviews.llvm.org/D118515
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