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Build an ordered vector of register mask operands (i.e., calls) when computing live intervals. Provide a checkRegMaskInterference() function that computes a bit mask of usable registers for a live range. This is a quick way of determining of a live range crosses any calls, and restricting it to the callee saved registers if it does. Previously, we had to discover call clobbers for each candidate register independently. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150077 91177308-0d34-0410-b5e6-96231b3b80d8
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