Add data-layout fields to build targets. #622
Merged
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Problem: Breaking change in rust-lang/rust#32939 makes the current nightly refuse to build without a data-layout field in the target json.
Solution: Take the data-layout emitted by clang for the target-triple and add it to the target json.
TODOs: Validate that clang's defaults are what we want. Documentation on data-layout format
Fixes: #620