[clang][Driver] Fix safestack -u ordering (#98468)

When re-enabling safestack testing on Solaris after the unexplained
b0260c5b1052f8e3ff1ec77dc42a11f42da762cc, all tests `FAIL`ed to link:

```
Undefined			first referenced
 symbol  			    in file
__safestack_unsafe_stack_ptr        buffer-copy-vla.o
__safestack_init                    (command line)
ld: fatal: symbol referencing errors
```

The problem is that `-u __safestack_init` was passed to the linker after
the corresponding version of `libclang_rt.safestack-*.a`. Since the
Solaris linker (like Unix linkers for decades) respects the command line
argument order (unlike e.g. GNU ld which uses GNU getopt), this cannot
work. Fixed by moving the `-u` arg further to the front. Two affected
testcases were fixed accordingly.

Tested on `amd64-pc-solaris2.11`, `sparcv9-sun-solaris2.11`,
`x86_64-pc-linux-gnu`, and `sparc64-unknown-linux-gnu`.

0 files changed, 0 insertions, 0 deletions