MC/AsmMatcher: Tweak conversion function name.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95802 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/AsmMatcherEmitter.cpp b/utils/TableGen/AsmMatcherEmitter.cpp
index 5b5dd2b..aafa5b3 100644
--- a/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/utils/TableGen/AsmMatcherEmitter.cpp
@@ -1081,7 +1081,7 @@
 
     // Add any trailing implicit operands.
     for (; CurIndex != NumMIOperands; ++CurIndex)
-      Signature += "Imp";
+      Signature += "__Imp";
 
     II.ConversionFnKind = Signature;