[compiler-rt] [libcxx] [libcxxabi] [libunwind] [runtimes][PAC] Harden unwinding when possible (PR #143230)

[Oliver Hunt via cfe-commits]

================
@@ -1047,18 +1051,26 @@ class UnwindCursor : public AbstractUnwindCursor{
   bool getInfoFromFdeCie(const typename CFI_Parser<A>::FDE_Info &fdeInfo,
                          const typename CFI_Parser<A>::CIE_Info &cieInfo,
                          pint_t pc, uintptr_t dso_base);
-  bool getInfoFromDwarfSection(pint_t pc, const UnwindInfoSections &sects,
-                                            uint32_t fdeSectionOffsetHint=0);
+  bool getInfoFromDwarfSection(const typename R::link_reg_t &pc,
+                               const UnwindInfoSections &sects,
+                               uint32_t fdeSectionOffsetHint = 0);
   int stepWithDwarfFDE(bool stage2) {
+#if __has_extension(ptrauth_calls)
----------------
ojhunt wrote:

sigh, I thought I had found all of the has_extension and has_feature checks 
everywhere (except for those places that define the macros we use -- the few 
places it seemed unnecessary should have been updated with `__PTRAUTH__` checks.

https://github.com/llvm/llvm-project/pull/143230
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