…ndle cases where an alloca is used only in one spindle, but that spindle does not match the spindle where the alloca is defined.

…ities and passes to treat exit blocks inside of tasks within a loop as part of the loop.

This commit uses the custom ValueMaterializer to properly materialize
a specified input syncregion, i.e., to ensure that any associated
debug info is properly updated.  In the future, this change may be
extended to support additional Target-specific customization of the
Tapir outlining process.

…sforming a Tapir function with taskframes for CSI or CilkSanitizer instrumentation. In particular, ensure that inserted cleanup blocks properly respect taksframe instrinsics; preserve the structural property that detaches unwind to the same destination as associated detached.rethrows; and exclude inserting instrumentation in placeholder basic blocks.

…te modifies the CFG.

…ias if an identified object underlying one access cannot escape before the other access.

…nto the spawned body of a Tapir loop in the continuation of a spawn in the caller is properly enclosed in a taskframe.

… and associated detached.rethrow destination are the same.

…ck that syncregions are not used in subtasks. Update test cases to satisfy Tapir task-structure verification.

…width to the outlined function it creates.

…noalias call or identified object assuming the Value is in the same spindle.

…te pointers with casts.

…tu 18.04