DominatorTreeTest.cpp: Add the file header.

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Whitespace.

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Untabify.

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IRTests/ConstantsTest.cpp: AsInstructionsTest: Delete each instruction immediately if it is not linked.

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IRTests/IRBuilderTest.cpp: Let GV added to the module.

It fixes --vg-leak.

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IRTests/IRBuilderTest.cpp: GetIntTy: Delete DL at yourself since it is not linked.

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IRTests/WaymarkTest.cpp: Fix in --vg-leak.

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llvm/unittests: Use OwningPtr to fix --vg-leak.

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