do not allow '.' in symbol names


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24292 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index 6bc3c50..ce7f4c8 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -834,6 +834,7 @@
 
   // Ensure that all structure types have names...
   Mang = new Mangler(M);
+  Mang->markCharUnacceptable('.');
 
   // get declaration for alloca
   Out << "/* Provide Declarations */\n";