reuse the result of some expensive computations in getSignExtendExpr() and getZeroExtendExpr()
this gives a speedup of > 80 in a debug build in the test case of PR12825 (php_sha512_crypt_r) llvm-svn: 156849
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this gives a speedup of > 80 in a debug build in the test case of PR12825 (php_sha512_crypt_r) llvm-svn: 156849