tree-optimization/106912 - clear const attribute from fntype
The following makes sure that after clearing pure/const from
instrumented function declarations we are adjusting call statements
fntype as well to handle indirect calls and because gimple_call_flags
looks at both decl and fntype.
Like the pure/const flag clearing on decls we refrain from touching
calls to known functions that do not have a body in the current TU.
PR tree-optimization/106912
* tree-profile.cc (tree_profiling): Update stmts only when
profiling or testing coverage. Make sure to update calls
fntype, stripping 'const' there.
* gcc.dg/profile-generate-4.c: New testcase.