avoid using ifunc + ASan
Summary: Code that is using ifunc dies with SIGSEGV on startup when used with ASan. Here is gdb output: {P2882504} Seems like `ifunc` dispatch is happening before ASan is initialized, but ASan instrumentation logic being called from there. Test Plan: built affected unicorn binaries with ASan, ran them, verified there is no more SIGSEGV Reviewed By: meyering@fb.com FB internal diff: D1013420
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