[gfortran PR 33626] Make sure parenthesized expression is correctly typed

[Tobias Schlüter]

I've committed the attached patch for this buglet as r129002.   FX 
tested it with a --enable-checking=types compiler and approved it in 
bugzilla.  I built and tested it on i386-darwin.

The patch simply makes sure that the types of parenthesized expressions 
are always propagated, as they should.

Cheers,
- Tobi
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