[lli] Make sure the exported __chkstk functions are included when exporting them

The trick we use (since cbc2a0623a39461b56bd9eeb308ca535f03793f8)
for exporting the __chkstk function (with various per-arch names)
that is defined in a different object file, relies on the function
already being linked in (by some function referencing it).

This function does end up referenced if there's a function that
allocates more than 4 KB on the stack. In most cases, it's referenced
somewhere, but in the case of builds with LLVM_LINK_LLVM_DYLIB
enabled (so most of the code resides in a separate libLLVM-<ver>.dll)
the only code in lli.exe is the lli tool specific code and the
mingw-w64 crt startup code. In the case of GCC based MinGW i386
builds with LLVM_LINK_LLVM_DYLIB, nothing else references it though.

Manually add a reference to the function to make sure it is linked
in (from libgcc or compiler-rt builtins) so that it can be exported.

This fixes one build issue encountered in
https://github.com/msys2/MINGW-packages/pull/18002.

Differential Revision: https://reviews.llvm.org/D159085

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