Implement parsing and semantic checking of the 'mutable' keyword.
Thanks to Doug for the review. Actual effects of mutable to follow.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59331 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseDecl.cpp b/lib/Parse/ParseDecl.cpp
index 0c1080a..99bebe6 100644
--- a/lib/Parse/ParseDecl.cpp
+++ b/lib/Parse/ParseDecl.cpp
@@ -405,6 +405,7 @@
 ///         'static'
 ///         'auto'
 ///         'register'
+/// [C++]   'mutable'
 /// [GNU]   '__thread'
 ///       function-specifier: [C99 6.7.4]
 /// [C99]   'inline'
@@ -550,6 +551,9 @@
     case tok::kw_register:
       isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_register, Loc, PrevSpec);
       break;
+    case tok::kw_mutable:
+      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_mutable, Loc, PrevSpec);
+      break;
     case tok::kw___thread:
       isInvalid = DS.SetStorageClassSpecThread(Loc, PrevSpec)*2;
       break;