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This function runs after all constant islands have been placed, and may shrink some instructions to their 2-byte forms. This can actually cause some constant pool entries to move out of range because of growing alignment padding. Treat instructions that may be shrunk the same as inline asm - they erode the known alignment bits. Also reinstate an old assertion in verify(). It is correct now that basic block offsets include alignments. Add a single large test case that will hopefully exercise many parts of the constant island pass. <rdar://problem/10670199> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147885 91177308-0d34-0410-b5e6-96231b3b80d8
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