[pull] swiftwasm from main #5453
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Because we don't know if external variables will be written Fixes a miscompile rdar://109476745
We may want to revisit this in the future, but for now let's avoid profiling code in generated buffers. To make this work we'll need to come up with a scheme for writing out the generated buffers such that tools like `llvm-cov` can reference them. rdar://109562235
The coverage format version we use is automatically set to whatever the latest version LLVM has. This resulting in us outputting version 6 as our format without having made the changes necessary to reflect the new format. Update the emission logic to take account for [the new changes in version 6][1] (we need to include the current working directory as the first element of the list of files we output). Additionally, add a `static_assert` so we don't get caught out by version bumps in the future. Note we can't pin our version, as it must stay in sync with the version Clang is using. [1]: https://llvm.org/docs/CoverageMappingFormat.html#llvm-ir-representation
ReadOnlyGlobalVariables: don't convert external global vars to lets
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