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[CodeGen][i386] Move -mregparm storage earlier and fix Runtime calls (l…
…lvm#89707) When building the Linux kernel for i386, the -mregparm=3 option is enabled. Crashes were observed in the sanitizer handler functions, and the problem was found to be mismatched calling convention. As was fixed in commit c167c0a ("[BuildLibCalls] infer inreg param attrs from NumRegisterParameters"), call arguments need to be marked as "in register" when -mregparm is set. Use the same helper developed there to update the function arguments. Since CreateRuntimeFunction() is actually part of CodeGenModule, storage of the -mregparm value is also moved to the constructor, as doing this in Release() is too late. Fixes: llvm#89670
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