[NVPTX] Improve NVVMReflect Efficiency (#134416)

The NVVMReflect pass simply replaces calls to nvvm-reflect functions
with the appropriate constant, either the architecture number, or
nvvm-reflect-ftz, found in the module's metadata.

The implementation is inefficient and does this by traversing through
all instructions to find calls. The common case is that you never call
nvvm-reflect, so this traversal is costly.

This PR:
- Updates the pass so that it finds the reflect functions by name, and
then traverses through their uses to find the calls directly.
- Adds a line (245) to make sure the dead nvvm-reflect definitions are
erased.
- Adds the ability to set reflect values via command line

0 files changed, 0 insertions, 0 deletions