[NVPTX] Auto-Upgrade some nvvm.annotations to attributes (#119261)

Add a new AutoUpgrade function to convert some legacy nvvm.annotations
metadata to function level attributes. These attributes are quicker to
look-up so improve compile time and are more idiomatic than using
metadata which should not include required information that changes the
meaning of the program.

Currently supported annotations are:

- !"kernel" -> ptx_kernel calling convention
- !"align" -> alignstack parameter attributes (return not yet supported)

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index e16e8a0..1a09e80 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -7157,6 +7157,8 @@ Error BitcodeReader::materializeModule() {
 
   UpgradeModuleFlags(*TheModule);
 
+  UpgradeNVVMAnnotations(*TheModule);
+
   UpgradeARCRuntime(*TheModule);
 
   return Error::success();