clangDriver depends on clangBasic, so clangBasic should not depend on
clangDriver, even just its header. Also remove clangBasic's dependency
on LLVMOption.
The issue can be seen through the bazel commit
d26dd681f9 which is reverted now.
Add hasFlagNoClaim and use it as we don't want to suppress
-Wunused-command-line-argument for -mexecute-only just because
-fsanitize= is specified.