I've found this out the hard way; LLVM will not normally catch this
error (unless -verify-machineinstrs is passed), and under certain
very specific circumstances (such as register scavenger running
under pressure) this would result in an opaque crash in codegen.
llvm-svn: 280071
memory locations -- not only the memory pointed to by a declared indirect
output.
+Note that clobbering named registers that are also present in output
+constraints is not legal.
+
Constraint Codes
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