MIR Serialization: Serialize the stack pseudo source values.

llvm-svn: 244806
diff --git a/llvm/lib/CodeGen/MIRPrinter.cpp b/llvm/lib/CodeGen/MIRPrinter.cpp
index d47ed97..019383c 100644
--- a/llvm/lib/CodeGen/MIRPrinter.cpp
+++ b/llvm/lib/CodeGen/MIRPrinter.cpp
@@ -710,6 +710,9 @@
     const PseudoSourceValue *PVal = Op.getPseudoValue();
     assert(PVal && "Expected a pseudo source value");
     switch (PVal->kind()) {
+    case PseudoSourceValue::Stack:
+      OS << "stack";
+      break;
     case PseudoSourceValue::ConstantPool:
       OS << "constant-pool";
       break;