Mark Mentovai 5906513e30 MinidumpContext: fix some problems in AMD64 (x86_64) context enums.
This fixes a sloppy compliation error: “Redefinition of enumerator
'kMinidumpContextX86Xstate'”. It also fixes CONTEXT_FULL, which should
contain floating-point registers but not segment registers unlike the
its 32-bit x86 equivalent.

Some comments are revised to provide better, um, context.

R=rsesek@chromium.org

Review URL: https://codereview.chromium.org/620663002
2014-09-30 17:22:35 -04:00
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