Merging r230694:

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r230694 | chaoren | 2015-02-26 14:15:16 -0800 (Thu, 26 Feb 2015) | 16 lines

Fix Bug 20400

Summary:
http://llvm.org/bugs/show_bug.cgi?id=20400

The default triple of i686-pc-linux-gnu for 32 bit linux targets is compatible
but not necessarily identical to the inferior binaries.

Applying Azat Khuzhin's solution of using ArchSpec::IsCompatibleMatch() instead
of ArchSpec::IsExactMatch() when comparing ObjectFile and Modules architecture.

Reviewers: vharron

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D7897
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llvm-svn: 232574