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Most code is oblivious to bundles and uses the MBB::iterator which only visits whole bundles. MBB::erase() operates on whole bundles at a time as before. MBB::remove() now refuses to remove bundled instructions. It is not safe to remove all instructions in a bundle without deleting them since there is no way of returning pointers to all the removed instructions. MBB::remove_instr() and MBB::erase_instr() will now update bundle flags correctly, lifting individual instructions out of bundles while leaving the remaining bundle intact. The MachineInstr convenience functions are updated so eraseFromParent() erases a whole bundle as before eraseFromBundle() erases a single instruction, leaving the rest of its bundle. removeFromParent() refuses to operate on bundled instructions, and removeFromBundle() lifts a single instruction out of its bundle. These functions will no longer accidentally split or coalesce bundles - bundle flags are updated to preserve the existing bundling, and explicit bundleWith* / unbundleFrom* functions should be used to change the instruction bundling. This API update is still a work in progress. I am going to update APIs first so they maintain bundle flags automatically when possible. Then I'll add stricter verification of the bundle flags. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170384 91177308-0d34-0410-b5e6-96231b3b80d8
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