[NFC] Add Compilation::Result #35034
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In order to extract the module dependency graph from the compilation the driver just ran, define a separate semantic type to hold a result code and the graph itself.
This required dropping some superfluous 'const' qualification in the module dependency graph.
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CodaFi
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Dec 12, 2020
VS2017 seems to have problems with ternaries where the two branches are given as std::move() (see https://stackoverflow.com/questions/53374182) and the compiler was given a warning C4172 "returning address of local or temporary". Switching the ternary operator into a `if/else` works correctly for VS2017 and should work for other compilers too, without changing the meaning (as far as I see). This was causing the Windows VS2017 CI to fail compiling the stdlib. When bisecting, the problem was reduced to the changes in #35034. In a debugger I managed to see the problem being a heap corruption. With all the moves I was suspicious that something was being used while destroyed, but the code was correct. While recompiling the compiler warning gave me the clue.
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Add a data structure to encapsulate the return code, the "had abnormal exit" bit, and the module dependency graph. The last of these is needed for a future patch to turn on cross-module incremental builds.