Insert stackmaps after (not before) calls.

This is so that the offset of the stackmap entry will record the
instruction after the call, which is where we want to continue after
deoptimisation.

Author: ptersilie

llvm/lib/Transforms/Yk/StackMaps.cpp

@@ -73,6 +73,12 @@ class YkStackmaps : public ModulePass {
       for (Value *A : L)
         Args.push_back(A);
 
+      if (isa<CallInst>(I)) {
+        // Insert the stackmap call after (not before) the call instruction, so
+        // the offset of the stackmap entry will record the instruction after
+        // the call, which is where we want to continue after deoptimisation.
+        Bldr.SetInsertPoint(I->getNextNonDebugInstruction());
+      }
       Bldr.CreateCall(SMFunc->getFunctionType(), SMFunc,
                       ArrayRef<Value *>(Args));
       Count++;