Clear GTF_CALL from non-calls in rationalize

[JosephTremoulet]

Since rationalization hoists comma antecedents out into separate
statements, any side-effects that the antecedent had might no longer apply
to the comma's ancestor nodes. Moreover, in LIR, side-effect flags need
only describe the immediate node; summary flags are computed when Ranges
are constructed. So, update rationalize to clear the GTF_CALL flag from
any node that is not a call. Failure to do so gives an
overly-conservative view of side-effects, which can inhibit dead store
removal.

[JosephTremoulet]

@pgavlin PTAL; this implements your suggestion from #10946.
/cc @dotnet/jit-contrib

jit-diff release --frameworks --tests shows just one diff, improved deadcode elimination:

Found files with textual diffs.
Summary:
(Note: Lower is better)
Total bytes of diff: -4 (0.00 % of base)
    diff is an improvement.
Total byte diff includes 0 bytes from reconciling methods
        Base had    0 unique methods,        0 unique bytes
        Diff had    0 unique methods,        0 unique bytes
Top file improvements by size (bytes):
          -4 : JIT\IL_Conformance\Old\Conformance_Base\starg_i\starg_i.dasm (-10.00 % of base)
1 total files with size differences (1 improved, 0 regressed), 6513 unchanged.
Top method improvements by size (bytes):
          -4 : JIT\IL_Conformance\Old\Conformance_Base\starg_i\starg_i.dasm - _starg:main(ref):int
1 total methods with size differences (1 improved, 0 regressed), 314382 unchanged.

[pgavlin]

LGTM. Thanks for doing this!

[CarolEidt]

LGTM