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i#3352 atomics and flags: clobber flags in inline asm of atomic operations

Merged Hendrik Greving requested to merge i3352-add-cc-clober-to-atomics into master

Add clobber flags directives to inline asm statements of atomic operations. Prevents compiler from moving flag modifying operations in between atomic and reading flags.

Issue might still exist in Windows where _Interlocked intrinsics are used.

Issue: #3352