Commits on Feb 25, 2020

1. fix unsilenceable warnings on GCC 9 …

   See issue rust-lang/rust#69078 for details
   
   ---
   
   [cmake] Disable GCC 9's -Winit-list-lifetime warning in ArrayRef
   
   Summary:
   This is a new warning which fires when one stores a reference to the
   initializer_list contents in a way which may outlive the
   initializer_list which it came from. In llvm this warning is triggered
   whenever someone uses the initializer_list ArrayRef constructor.
   
   This is indeed a dangerous thing to do (I myself was bitten by that at
   least once), but it is not more dangerous than calling other ArrayRef
   constructors with temporary objects -- something which we are used to
   and have accepted as a tradeoff for ArrayRef's efficiency.
   
   Currently, this warnings generates so much output that it completely
   obscures any actionable warnings, so this patch disables it.
   
   Reviewers: rnk, aaron.ballman
   
   Subscribers: mgorny, llvm-commits
   
   Tags: #llvm
   
   Differential Revision: https://reviews.llvm.org/D70122
   
   (cherry picked from commit 6c2151b)

   

   labath authored and contrun committed Feb 25, 2020
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