Add preliminary (and probably broken) codegen support for C++ static initializers.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55180 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGDecl.cpp b/lib/CodeGen/CGDecl.cpp
index 1d17210..b60e20f 100644
--- a/lib/CodeGen/CGDecl.cpp
+++ b/lib/CodeGen/CGDecl.cpp
@@ -86,7 +86,13 @@
   if ((D.getInit() == 0) || NoInit) {
     Init = llvm::Constant::getNullValue(LTy);
   } else {
-    Init = CGM.EmitConstantExpr(D.getInit(), this);
+    if (D.getInit()->isConstantExpr(getContext(), 0))
+      Init = CGM.EmitConstantExpr(D.getInit(), this);
+    else {
+      assert(getContext().getLangOptions().CPlusPlus && 
+             "only C++ supports non-constant static initializers!");
+      return GenerateStaticCXXBlockVarDecl(D);
+    }
   }
 
   assert(Init && "Unable to create initialiser for static decl");