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Upgrade to LLVM 4.0 #37609

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@shepmaster

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@shepmaster

The AVR-Rust post continues to track AVR-LLVM, which is tracking upstream LLVM. That means we are running into changes from the future LLVM 4.0. I figured we could open up this issue now to track the changes required to stay compatible.

This is the current list of upgrade hazards. Note that some of the text may be nonsensical as I don't truly grok all the internals of LLVM so some changes are wild stabs in the dark. It's also possible that some failed fix for earlier problems actually caused later problems:


A WIP PR that performs the upgrade! #40123


Some issues whose resolution is believed to be blocked on LLVM 4.0:

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    A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-enhancementCategory: An issue proposing an enhancement or a PR with one.E-hardCall for participation: Hard difficulty. Experience needed to fix: A lot.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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