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[winasan] Reduce hotpatch prefix check to 8 bytes

Authored by dmajor on Sep 20 2018, 7:28 AM.

Description

[winasan] Reduce hotpatch prefix check to 8 bytes

Same idea as r310419: The 8 byte nop is a suffix of the 9 byte nop, and we need at most 6 bytes.

Differential Revision: https://reviews.llvm.org/D51788

llvm-svn: 342649

Details