Teach stack promotion to walk the CFG when a potential reuse of an allocation is found to see if it can actually happen instead of just assuming it will. This allows it to catch cases like {{{ int i; Foo f; while (cond(i)) f = new Foo(i++); return f.value; }}} where it previously wouldn't because a phi using the allocation would appear in the condition block to propagate it to the use after the loop.

#!/bin/sh

g++ llvm-ext.cpp -c `llvm-config --cxxflags`
g++ llvm-opt.cpp -c `llvm-config --cxxflags`
g++ llvm-typemonitor.cpp -c `llvm-config --cxxflags`

rm -f libllvm-c-ext.a
ar rc libllvm-c-ext.a llvm-ext.o llvm-opt.o llvm-typemonitor.o
ranlib libllvm-c-ext.a