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r166198 migrated the strcpy optimization to instcombine. The strcpy simplifier that was migrated from Transforms/Scalar/SimplifyLibCalls.cpp was also doing some __strcpy_chk simplifications. Those fortified simplifications were migrated as well, but introduced a bug in the __stpcpy_chk simplifier in the process. This happened because the __strcpy_chk and __stpcpy_chk simplifiers were both mapped to StrCpyChkOpt which was updated with simplifications that worked for __strcpy_chk, but not __stpcpy_chk. This patch fixes the problem by adding proper test coverage and creating a new simplifier for __stpcpy_chk (instead of sharing one with __strcpy_chk). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167082 91177308-0d34-0410-b5e6-96231b3b80d8
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