Commits on Jul 10, 2018

1. Upgrade to LLVM's master branch (LLVM 7) …

   This commit upgrades the main LLVM submodule to LLVM's current master branch.
   The LLD submodule is updated in tandem as well as compiler-builtins.
   
   Along the way support was also added for LLVM 7's new features. This primarily
   includes the support for custom section concatenation natively in LLD so we now
   add wasm custom sections in LLVM IR rather than having custom support in rustc
   itself for doing so.
   
   Some other miscellaneous changes are:
   
   * We now pass `--gc-sections` to `wasm-ld`
   * The optimization level is now passed to `wasm-ld`
   * A `--stack-first` option is passed to LLD to have stack overflow always cause
     a trap instead of corrupting static data
   * The wasm target for LLVM switched to `wasm32-unknown-unknown`.
   * The syntax for aligned pointers has changed in LLVM IR and tests are updated
     to reflect this.
   * The `thumbv6m-none-eabi` target is disabled due to an [LLVM bug][llbug]
   
   Nowadays we've been mostly only upgrading whenever there's a major release of
   LLVM but enough changes have been happening on the wasm target that there's been
   growing motivation for quite some time now to upgrade out version of LLD. To
   upgrade LLD, however, we need to upgrade LLVM to avoid needing to build yet
   another version of LLVM on the builders.
   
   The revision of LLVM in use here is arbitrarily chosen. We will likely need to
   continue to update it over time if and when we discover bugs. Once LLVM 7 is
   fully released we can switch to that channel as well.
   
   [llbug]: https://bugs.llvm.org/show_bug.cgi?id=37382

   

   alexcrichton committed Jul 10, 2018
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