Merge pull request #66333 from al45tair/eng/PR-110260855

[Backtracing][IRGen] Add a semantic attribute to force frame pointer.

lib/IRGen/IRGenSIL.cpp

@@ -21,6 +21,7 @@
 #include "swift/AST/IRGenOptions.h"
 #include "swift/AST/ParameterList.h"
 #include "swift/AST/Pattern.h"
+#include "swift/AST/SemanticAttrs.h"
 #include "swift/AST/SubstitutionMap.h"
 #include "swift/AST/Types.h"
 #include "swift/Basic/ExternalUnion.h"
@@ -1854,6 +1855,11 @@ IRGenSILFunction::IRGenSILFunction(IRGenModule &IGM, SILFunction *f)
     }
   }
 
+  // If we have @_semantics("use_frame_pointer"), force the use of a
+  // frame pointer for this function.
+  if (f->hasSemanticsAttr(semantics::USE_FRAME_POINTER))
+    CurFn->addFnAttr("frame-pointer", "all");
+
   // Disable inlining of coroutine functions until we split.
   if (f->getLoweredFunctionType()->isCoroutine()) {
     CurFn->addFnAttr(llvm::Attribute::NoInline);