Improve RefreshCallGraph to remove invalid call graph edge.
Improve RefreshCallGraph to remove invalid call graph edge.

With commit r219944, InstCombine can now turn a sqrtl into a llvm.fabs.f64.
The call graph edge originally representing the call to sqrtl becomes invalid.
This patch modifies CGPassManager::RefreshCallGraph() to remove the invalid
call graph edge, which can triggers an assert in
CallGraphNode::addCalledFunction().

Phabricator Review: http://reviews.llvm.org/D7705
Patch by Lawrence Hu <lawrence@codeaurora.org>.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@234902 91177308-0d34-0410-b5e6-96231b3b80d8

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