[PATCH] tree-optimization/103464 - Also pre-process PHIs in range-of-stmt.

[Andrew MacLeod]

When I flatten the call stack for range_of_stmt in PR 103231 ( 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103231 ), I mention that I 
was only flattening it for chains of statements with range handlers. If 
it turned out that PHI chaining was also a problem, we could also do PHIs.

The cost to do phis is quite nominal, and resolve this testcase...  so 
we might as well do PHIs as well.

Bootstrapped on x86_64-pc-linux-gnu with no regressions.  OK?

Andrew
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