Fix x64 debug precompiled runtime build.

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index 49f1f92e03b332d3846679dbf18a21b822978769..fbb5455b6834a847fa1db69e44b598b6f636e5df 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -14513,6 +14513,11 @@ void ParsedFunction::AllocateIrregexpVariables(intptr_t num_stack_locals) {
 }
 
 
+void ParsedFunction::Bailout(const char* origin, const char* reason) const {
+  UNREACHABLE();
+}
+
+
 void Parser::ParseCompilationUnit(const Library& library,
                                   const Script& script) {
   UNREACHABLE();