Preserve noinline/debug callsite info when lowering Enzyme autodiff calls

[Copilot]

Enzyme was dropping callsite noinline metadata during lowering, which made rewritten calls inlineable and could trigger LLVM verifier failures (inlinable function call ... must have a !dbg location). This PR preserves the relevant callsite properties on replacement calls.

• Root cause addressed

  • HandleAutoDiff created a new derivative call but did not carry forward callsite noinline.
  • __enzyme_call_inactive lowering created replacement calls without propagating debug location and noinline.

• Code changes

  • Enzyme/Enzyme.cpp
    • In HandleAutoDiff(...), propagate Attribute::NoInline from the original call to the generated derivative call.
    • In inactive-call lowering (InactiveCalls loop), propagate both:
      • DebugLoc (setDebugLoc(CI->getDebugLoc()))
      • Attribute::NoInline (if present on the original call).

• Regression coverage

  • test/Enzyme/ReverseMode/undefalloc.ll
    • Mark the __enzyme_autodiff callsite as noinline.
    • Assert the rewritten call to @diffef remains noinline.

CallInst *diffretc = cast<CallInst>(Builder.CreateCall(newFunc, args));
diffretc->setDebugLoc(CI->getDebugLoc());
if (CI->hasFnAttr(Attribute::NoInline))
  diffretc->addFnAttr(Attribute::NoInline);

// ...

auto Rep = B.CreateCall(FT, fn, Args);
Rep->setDebugLoc(CI->getDebugLoc());
if (CI->hasFnAttr(Attribute::NoInline))
  Rep->addFnAttr(Attribute::NoInline);