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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