land David Blaikie's patch to de-constify Type, with a few tweaks.

llvm-svn: 135375
diff --git a/llvm/lib/Target/Mips/MipsTargetObjectFile.cpp b/llvm/lib/Target/Mips/MipsTargetObjectFile.cpp
index cf5d1b5..05c46f5 100644
--- a/llvm/lib/Target/Mips/MipsTargetObjectFile.cpp
+++ b/llvm/lib/Target/Mips/MipsTargetObjectFile.cpp
@@ -79,7 +79,7 @@
   if (Kind.isMergeable1ByteCString())
     return false;
 
-  const Type *Ty = GV->getType()->getElementType();
+  Type *Ty = GV->getType()->getElementType();
   return IsInSmallSection(TM.getTargetData()->getTypeAllocSize(Ty));
 }