[SFrames] reland Emit and relax FREs #158154 (#159643) [Previously reverted due to msan failures on two uninitialized padding bits.] This PR emits and relaxes the FREs generated in the previous PR. After this change llvm emits usable sframe sections that can be linked with the gnu linker. There are a few remaining cfi directives to handle before they are generally usable, however. The output isn't identical with gnu-gas in every case (this code produces fewer identical FREs in a row than gas), but I'm reasonably sure that they are correct regardless. There are even more size optimizations that can be done later. Also, while working on the tests, I found a few bugs in older portions and cleaned those up. This is a fairly big commit, but I'm not sure how to make it smaller.
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