AArch64: avoid deleting the current iterator in a loop.
AArch64: avoid deleting the current iterator in a loop.

std::map invalidates the iterator to any element that gets deleted, which means
we can't increment it correctly afterwards. This was causing Darwin test
failures.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@215233 91177308-0d34-0410-b5e6-96231b3b80d8

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