llvm-project

e8fc808b - Reapply "MCFragment: Use trailing data for fixed-size part" (#150846)

Reapply "MCFragment: Use trailing data for fixed-size part" (#150846) The fixed-size content of the MCFragment object is now stored as trailing data, replacing ContentStart/ContentEnd with ContentSize. The available space for trailing data is tracked using `FragSpace`. If the available space is insufficient, a new block is allocated within the bump allocator `MCObjectStreamer::FragStorage`. FragList::Tail cannot be reused when switching sections or subsections, as it is not associated with the fragment space tracked by `FragSpace`. Instead, allocate a new fragment, which becomes less expensive after #150574. Data can only be appended to the tail fragment of a subsection, not to fragments in the middle. Post-assembler-layout adjustments (such as .llvm_addrsig and .llvm.call-graph-profile) have been updated to use the variable-size part instead. --- This reverts commit a2fef664c29a53bfa8a66927fcf8b2e5c9da4876, which reverted the innocent f1aa6050bd90f8ec4273da55d362e23905ad3a81 . Commit df71243fa885cd3db701dc35a0c8d157adaf93b3, the MCOrgFragment fix, has fixed the root cause of https://github.com/ClangBuiltLinux/linux/issues/2116