[clang][Driver] Clean up UEFI linker argument handling (#159639) This makes the UEFI driver's handling of linking more canonical in a few ways: * Use /option:value syntax with lld-link as in the MSVC driver. * Handle -nostdlib, -nodefaultlibs, -r and call common subroutines when they aren't set. This covers sanitizer and profile runtimes and their associated switches; compiler-rt builds do not yet provide these libraries, but the driver behavior is opt-in and supports all the opt-in/out plumbing like other targets do. This lets command lines immediately use the opt-out switches even when they are superfluous for opt-in features, as build system plumbing often needs to do. It also updates some TODO comments for how the driver behavior will look when more runtime support is ready.
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