Check in gcc sources for prebuilt toolchains in Eclair.

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diff --git a/gcc-4.2.1/contrib/reghunt/README b/gcc-4.2.1/contrib/reghunt/README
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+This directory contains scripts that are used for identifying the
+patch that introduced a regression.  General information about such
+searches is covered in http://gcc.gnu.org/bugs/reghunt.html.
+
+  reg_search searches for a small time interval within a range of
+  dates in which results for a test changed, using a binary search.
+  The functionality for getting sources, building the component to
+  test, and running the test are in other scripts that are run from
+  here.
+
+  reg_periodic invokes separate tools (the same scripts invoked by
+  reg_search) over a range of dates at specified intervals.
+
+  reg_test_template shows the format for the script that runs a test
+  and determines whether to continue the search with a later or
+  earlier date.