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a55b30a225
creating the keys and doing comparisons to index into 'Map' takes a lot of time. For these large constants, keep an inverse map so that 'remove' and move operations are much faster. This speeds up a release build of the bc reader on Eric's nasty python bytecode file from 1:39 to 1:00s. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23624 91177308-0d34-0410-b5e6-96231b3b80d8
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