Fix a file name.

From-SVN: r255826

diff --git a/gcc/testsuite/g++.dg/abi/pr83490.C b/gcc/testsuite/g++.dg/abi/pr83489.C
similarity index 100%
rename from gcc/testsuite/g++.dg/abi/pr83490.C
rename to gcc/testsuite/g++.dg/abi/pr83489.C