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Summary: x86 allows either ordering for the LOCK and DATA16 prefixes, but using GCC+GAS leads to different code generation than using LLVM. This change matches the order that GAS emits the x86 prefixes when a semicolon isn't used in inline assembly (see tc-i386.c comment before define LOCK_PREFIX), and helps simplify tooling that operates on the instruction's byte sequence (such as NaCl's validator). This change shouldn't have any performance impact. Test Plan: ninja check Reviewers: craig.topper, jvoung Subscribers: jfb, llvm-commits Differential Revision: http://reviews.llvm.org/D6630 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224283 91177308-0d34-0410-b5e6-96231b3b80d8
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