nvptx: Support '-march=sm_50'

Adds support for the sm_50 architecture to the nvptx backend.

By Thomas Schwinge April 16, 2026 committed

The nvptx backend now supports the ‘-march=sm_50’ option. This commit adds the necessary definitions and adjustments to the compiler, including updating the documentation, options, and test suite. A new test case is also added to verify the functionality.

Filed Under: nvptxgpusm_50code generation

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