[clang] Replace asm with __asm__ in cuda header

Asm is a gnu extension for C, so at present -fopenmp -std=c99
and similar fail to compile on nvptx, bug 51344

Changing to `__asm__` or `__asm` works for openmp, all three appear to work
for cuda. Suggesting `__asm__` here as `__asm` is used by MSVC with different
syntax, so this should make for better error diagnostics if the header is
passed to a compiler other than clang.

Reviewed By: tra, emankov

Differential Revision: https://reviews.llvm.org/D107492

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