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bda00bbff2
The IR tests were getting kind of unwieldy. We were using "ir.cpp" to contain test cases that covered both IR construction (every language construct imaginable) and SSA construction. We would then build and dump all three flavors of IR. For IR construction tests, examining the SSA dumps when you add a new test case is tedious. To make this easier to manage, I've split the SSA-specific test cases out into a separate directory. "ir.cpp" should now contain only IR construction test cases, and "ssa.cpp" should contain only SSA construction test cases. We dump just the raw IR for "ir.cpp", and just the two SSA flavors for "ssa.cpp". We still run all three flavors of the IR sanity tests for "ir.cpp", though. I also removed the "ssa_block_count.ql" test, which wasn't really adding any coverage, because any change to the block count would be reflected in the dump as well.