Commits on Mar 5, 2021

1. Silence swiftmodule timestamp warnings …

   As part of bazelbuild#13091 dsymtuil started producing these warnings:
   
   ```
   warning: Timestamp mismatch for bazel-out/ios-x86_64-min11.0-applebin_ios-ios_x86_64-fastbuild-ST-7786d55448f4/bin/Modules/DependencyInjection/DependencyInjection.swiftmodule: 2021-03-05 13:54:33.542331246 and 1969-12-31 16:00:00.000000000
   ```
   
   In general we're happily ignoring this to get hermetic outputs instead (it's being compared against the file modification timestamp)
   
   This change disables this warning.
   
   It appears this feature has been around for at least 3 years swiftlang/llvm-project@2dd9848 so we should be good for all the versions of Xcode we support.
   
   Relevant logic: https://github.com/apple/llvm-project/blob/902bb11a46eb82e81d7e8b34450481e143a208b2/llvm/tools/dsymutil/DwarfLinkerForBinary.cpp#L407-L421

   

   keith committed Mar 5, 2021
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