make inst_begin/inst_end iterate over InstructionsByEnumValue.
Use CodeGenTarget::getInstNamespace in one place and fix it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98915 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/InstrEnumEmitter.cpp b/utils/TableGen/InstrEnumEmitter.cpp
index 4162107..47a8474 100644
--- a/utils/TableGen/InstrEnumEmitter.cpp
+++ b/utils/TableGen/InstrEnumEmitter.cpp
@@ -26,14 +26,7 @@
   CodeGenTarget Target;
 
   // We must emit the PHI opcode first...
-  std::string Namespace;
-  for (CodeGenTarget::inst_iterator II = Target.inst_begin(), 
-       E = Target.inst_end(); II != E; ++II) {
-    if (II->second.Namespace != "TargetOpcode") {
-      Namespace = II->second.Namespace;
-      break;
-    }
-  }
+  std::string Namespace = Target.getInstNamespace();
   
   if (Namespace.empty()) {
     fprintf(stderr, "No instructions defined!\n");