[clang] [clang][driver] Suppress gnu-line-marker when saving temps (PR #134621)

[Fangrui Song via cfe-commits]

MaskRay wrote:

I am not sure clang driver should does this unusual suppression.

You'd also get a warning with: `clang test.c -E  -Wall -pedantic; clang test.i -S -Wall -pedantic`

There might be a different strategy to suppress this diagnostic?

https://github.com/llvm/llvm-project/pull/134621