[Bug 280936] cannot build world with ASAN enabled

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280936

--- Comment #10 from Dimitry Andric <dim@FreeBSD.org> ---
Right, I knew I had seen this before:
https://github.com/llvm/llvm-project/issues/87923 [After 7740565f56ce,
"Assertion failed: (isa<Function>(Callee) || isa<GlobalAlias>(Callee)),
function analyzeAllUses" with -asan-use-stack-safety]

This looks like the same sort of thing. The minimized test case I arrived at
now was slightly different:

typedef int uint32_t;
void sysarch(int, void *);
#define DEFINE_UIFUNC(qual, ret_type, name, args)                             
\
  ret_type name args __attribute__((ifunc(#name "_resolver")));               
\
  ret_type(*name##_resolver(uint32_t cpu_feature2)) args
int __fillcontextx2_xfpu() {
  int xfpu;
  sysarch(2, &xfpu);
  return 0;
}
int __fillcontextx2_noxfpu();
DEFINE_UIFUNC(, int, __fillcontextx2, (char *)) {
  return cpu_feature2 ? __fillcontextx2_xfpu : __fillcontextx2_noxfpu;
}
void __fillcontextx(char *ctx) { __fillcontextx2(ctx); }

I'll need do ping the assignee of the upstream bug again.

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