llvm dev - Sep 2019 - flags/metadata/attributes on phi nodes

I recently made a change that would allow fast-math-flags to appear on phi
nodes of floating-point values in IR:
https://reviews.llvm.org/D67564 (r372878)

As noted there, the patch is an extension of allowing FMF on select-of-FP,
and the underlying motivation is to clean up semantics of FMF as described
in:
https://bugs.llvm.org/show_bug.cgi?id=38086
...and related bugs.

Does allowing these flags or other metadata/attributes on phi nodes raise
any concerns?
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