e5ec997164
Without the change `swift` build fails on bundled `llvm` on
`staging-next` as:
In file included from /build/src/llvm-project/llvm/lib/Support/Signals.cpp:14:
/build/src/llvm-project/llvm/include/llvm/Support/Signals.h:119:24:
error: unknown type name 'uintptr_t'; did you mean '__intptr_t'?
void CleanupOnSignal(uintptr_t Context);
^~~~~~~~~
__intptr_t
THe change pulls in upstream fix.