[Attributor][NFC][WIP] Increase the dependence recompute interval

[jdoerfert]

Summary

The flag determines how often we throw away dependence information and
start from scratch running all attributes. It does not change the
outcome but only the number of iterations and time it takes to get
there. Initial tests suggest compile time decreases with a higher
number.

TODO: Changes to the tests are missing.

[jdoerfert]

The entire thing will be removed soon

llvm/lib/Transforms/IPO/Attributor.cpp

 
 static cl::opt<bool> AnnotateDeclarationCallSites(
     "attributor-annotate-decl-cs", cl::Hidden,
     cl::desc("Annotate call sites of function declarations."), cl::init(false));
 
 static cl::opt<unsigned> DepRecInterval(
     "attributor-dependence-recompute-interval", cl::Hidden,
     cl::desc("Number of iterations until dependences are recomputed."),
-    cl::init(4));
+    cl::init(16));
 
 static cl::opt<bool> EnableHeapToStack("enable-heap-to-stack-conversion",
                                        cl::init(true), cl::Hidden);
 
 static cl::opt<bool>
     AllowShallowWrappers("attributor-allow-shallow-wrappers", cl::Hidden,
                          cl::desc("Allow the Attributor to create shallow "
                                   "wrappers for non-exact definitions."),