Chris convinced me that the default size of the SmallVector (2) was too

small.  Since it doesn't cost much to have 2 more (8 bytes), but not having
them would require a malloc as soon as the third one is needed. Setting
the default to 4 delays the malloc until the 5th parameter attribute.

llvm-svn: 35793

include/llvm/ParameterAttributes.h

@@ -156,7 +156,7 @@ class ParamAttrsList {
       uint16_t index; ///< Index of the parameter for which the attributes apply
     };
 
-    SmallVector<ParamAttrsWithIndex,2> attrs; ///< The list of attributes
+    SmallVector<ParamAttrsWithIndex,4> attrs; ///< The list of attributes
   /// @}
 };