Move DK_Misexpect for compatability with getNextAvailablePluginDiagnosticKind

[paulkirth]

Summary

Moves DK_Misexpect for compatibility with getNextAvailablePluginDiagnosticKind

First identified after D66324 landed.

[lebedev.ri]

LG

llvm/include/llvm/IR/DiagnosticInfo.h

enum DiagnosticKind {
   DK_LastRemark = DK_OptimizationFailure,
   DK_MachineOptimizationRemark,
   DK_MachineOptimizationRemarkMissed,
   DK_MachineOptimizationRemarkAnalysis,
   DK_FirstMachineRemark = DK_MachineOptimizationRemark,
   DK_LastMachineRemark = DK_MachineOptimizationRemarkAnalysis,
   DK_MIRParser,
   DK_PGOProfile,
+  DK_MisExpect,
   DK_Unsupported,
-  DK_FirstPluginKind,
-  DK_MisExpect
+  DK_FirstPluginKind // Must be last value to work with
+                     // getNextAvailablePluginDiagnosticKind
 };
 
 /// Get the next available kind ID for a plugin diagnostic.
 /// Each time this function is called, it returns a different number.
 /// Therefore, a plugin that wants to "identify" its own classes
 /// with a dynamic identifier, just have to use this method to get a new ID
 /// and assign it to each of its classes.
 /// The returned ID will be greater than or equal to DK_FirstPluginKind.