Handle "#pragma GCC visibility" in a few more places.  Switch over "#pragma pack" to use the same handling that gcc does.  Fixes <rdar://problem/10871094> and <rdar://problem/10893316>.

(Hopefully, common usage of these pragmas isn't irregular enough to break our current handling.  Doug has ideas for a more crazy approach if necessary.)

llvm-svn: 151307
diff --git a/clang/lib/Parse/ParseStmt.cpp b/clang/lib/Parse/ParseStmt.cpp
index 3537768..0ce73cb 100644
--- a/clang/lib/Parse/ParseStmt.cpp
+++ b/clang/lib/Parse/ParseStmt.cpp
@@ -280,6 +280,14 @@
 
   case tok::kw___try:
     return ParseSEHTryBlock(attrs);
+
+  case tok::annot_pragma_vis:
+    HandlePragmaVisibility();
+    return StmtEmpty();
+
+  case tok::annot_pragma_pack:
+    HandlePragmaPack();
+    return StmtEmpty();
   }
 
   // If we reached this code, the statement must end in a semicolon.