[SampleProfile] Preserve first stale profile CG match
During stale profile LCS matching, the matcher may compare the same IR function against multiple profile candidates. This can happen for overloads that share a demangled basename. The comparison result is useful for the current LCS, but rewriting FuncToProfileNameMap on every successful comparison can replace the profile selected for an IR function with a later candidate.
If another IR function is also matched to that later candidate, both functions can end up using the same stale CFG location map and runStaleProfileMatching asserts that the map is already populated.
Preserve the first selected profile mapping with try_emplace while still caching each pairwise comparison result. Add a regression with a minimal sample profile that used to trigger the assertion.
[PAC][lld] Properly handle `.relr.auth.dyn` -> `.rela.dyn` movement (#195649)
Address the following issues reported in #171475:
1. Proper adjustment of `__rela_iplt_end` address if a move from
`.relr.auth.dyn` to `.rela.dyn` took place
2. Set `__rela_iplt_start` properly if prior to such movement from
`.relr.auth.dyn`, the `.rela.dyn` was empty
3. Allocate enough space for both RELA* and AARCH64_AUTH_RELR* tags in
the `.dynamic` section in case we end up with both `.relr.auth.dyn` and
`.rela.dyn`. If one of the sections becomes empty - just pad the
`.dynamic` section with null tags in the end.
Resolves #171475
---------
Co-authored-by: Jessica Clarke <jrtc27 at jrtc27.com>
Revert [X86] EltsFromConsecutiveLoads - handle trunc(wideload()) patterns (#199371) (#208960)
Reverts llvm/llvm-project#199371.
The strided path emits wide loads without checking that the widened
range is dereferenceable. The last wide load reads up to (stride -
element) bytes past the last element and faults when the data ends at a
page boundary. Flagged by @nikic in
https://github.com/llvm/llvm-project/pull/199371#issuecomment-4947406318.
Reproducer on current main **MADE WITH CLAUDE OPUS**
strided.ll, 8 x i16 at a 4 byte stride, the source only touches bytes
[0, 30):
```llvm
define void @strided8i16(ptr %p, ptr %out) {
%g0 = getelementptr inbounds i8, ptr %p, i64 0
%g1 = getelementptr inbounds i8, ptr %p, i64 4
%g2 = getelementptr inbounds i8, ptr %p, i64 8
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