Fold stack-map call into switch instruction

Author: Jake Hughes

llvm/lib/YkIR/YkIRWriter.cpp

@@ -684,7 +684,9 @@ class YkIRWriter {
     for (auto &Case : I->cases()) {
       serialiseBlockLabel(Case.getCaseSuccessor());
     }
-
+    // safepoint:
+    CallInst *SMI = dyn_cast<CallInst>(I->getPrevNonDebugInstruction());
+    serialiseStackmapCall(SMI, VLMap);
     InstIdx++;
   }