Chris Lattner 0bf7bad0c3 * Add better caching of data to avoid silly recusions
* Only check to see if uses of instructions can be converted for expressions... so we don't look at all of the uses of a constant.  This was making the code unnecessarily conservative


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1218 91177308-0d34-0410-b5e6-96231b3b80d8
2001-11-08 22:06:31 +00:00
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