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mattip committed 62009b8

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pypy/doc/whatsnew-head.rst

 mapdicts keep track of whether or not an attribute is every assigned to
 multiple times. If it's only assigned once then an elidable lookup is used when
 possible.
+
+.. branch: precompiled-headers
+Create a Makefile using precompiled headers for MSVC platforms.
+The downside is a messy nmake-compatible Makefile. Since gcc shows minimal
+speedup, it was not implemented.
+
+