[llvm] [NVPTX] add an optional early copy of byval arguments (PR #113384)

[Justin Lebar via llvm-commits]

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@@ -64,6 +64,11 @@ static cl::opt<bool> UseShortPointersOpt(
         "Use 32-bit pointers for accessing const/local/shared address spaces."),
     cl::init(false), cl::Hidden);
 
+static cl::opt<bool> EarlyByValArgsCopy(
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jlebar wrote:

Perhaps copy/paste the PR description on top of this flag?  Seems like very useful context.

https://github.com/llvm/llvm-project/pull/113384