rename lltok::Metadata -> lltok::exclaim.  We name tokens 
after their syntactic form, not their semantic form.

llvm-svn: 92294
diff --git a/llvm/lib/AsmParser/LLToken.h b/llvm/lib/AsmParser/LLToken.h
index 11657667..4cf3122 100644
--- a/llvm/lib/AsmParser/LLToken.h
+++ b/llvm/lib/AsmParser/LLToken.h
@@ -29,6 +29,7 @@
     less, greater,     // <  >
     lparen, rparen,    // (  )
     backslash,         // \    (not /)
+    exclaim,           // !
 
     kw_x,
     kw_begin,   kw_end,
@@ -131,9 +132,6 @@
     StringConstant,    // "foo"
     NamedOrCustomMD,   // !foo
 
-    // Metadata valued tokens.
-    Metadata,          // !"foo" !{i8 42}
-
     // Type valued tokens (TyVal).
     Type,