[clang] [llvm] [NVPTX] Support inline asm with 128-bit operand in NVPTX backend (PR #97113)

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Chengjunp wrote:

> This needs to be documented in the langref in this section, right? https://llvm.org/docs/LangRef.html#supported-constraint-code-list
Oh, you are right. Thank you for pointing this out. Which file should I modify? Is it `llvm/docs/LangRef.rst`? Thanks!


https://github.com/llvm/llvm-project/pull/97113