give alpha its readonly section.  This optimizes alpha, and prevents a
testsuite regression with a coming patch.

llvm-svn: 77832
diff --git a/llvm/lib/Target/Alpha/AlphaISelLowering.cpp b/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
index 001723a..73fab21 100644
--- a/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
+++ b/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
@@ -40,6 +40,8 @@
                                      SectionKind::get(SectionKind::Text));
     DataSection = getOrCreateSection("_data", true, 
                                      SectionKind::get(SectionKind::DataRel));
+    ReadOnlySection = getOrCreateSection("_rodata", true, 
+                                     SectionKind::get(SectionKind::ReadOnly));
   }
 };
 }