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FDE refers to the immediately preceding CIE, and gives up if that isn't so. Well, that isn't so, and this commit fixes it. Now FDEs may refer to CIEs seen arbitrarily far back. This fixes some missing stack traces on AMD64. Also add some comments giving a top-level sketch of how the CFI reader works. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3861