[clang][driver] Use $ prefix with config file options to have them added after all of the command line options (#117573) Currently, if a -l (or -Wl,) flag is added into a config file (e.g. clang.cfg), it is situated before any object file in the effective command line. If the library requested by given -l flag is static, its symbols will not be made visible to any of the object files provided by the user. Also, the presence of any of the linker flags in a config file confuses the driver whenever the user invokes clang without any parameters (see issue #67209). This patch attempts to solve both of the problems, by allowing a split of the arguments list into two parts. The head part of the list will be used as before, but the tail part will be appended after the command line flags provided by the user and only when it is known that the linking should occur. The $-prefixed arguments will be added to the tail part.
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