Fix perf_submit() calls with array data crashing libbcc

A perf_submit() call like:

	unsigned char buf[16] = ...;
	output.perf_submit(ctx, buf, sizeof(buf));

Passes a non-pointer arg1, so getPointeeType().getTypePtr() is invalid,
and crashes libbcc.
Use getTypePtrOrNull() instead to avoid it.

Signed-off-by: Yonatan Goldschmidt <[email protected]>

Author: Jongy

src/cc/frontends/clang/b_frontend_action.cc

@@ -925,8 +925,8 @@ bool BTypeVisitor::VisitCallExpr(CallExpr *Call) {
           // events.perf_submit(ctx, &data, sizeof(data));
           // ...
           //                       &data   ->     data    ->  typeof(data)        ->   data_t
-          auto type_arg1 = Call->getArg(1)->IgnoreCasts()->getType().getTypePtr()->getPointeeType().getTypePtr();
-          if (type_arg1->isStructureType()) {
+          auto type_arg1 = Call->getArg(1)->IgnoreCasts()->getType().getTypePtr()->getPointeeType().getTypePtrOrNull();
+          if (type_arg1 && type_arg1->isStructureType()) {
             auto event_type = type_arg1->getAsTagDecl();
             const auto *r = dyn_cast<RecordDecl>(event_type);
             std::vector<std::string> perf_event;