[fortran,patch] Support for IEEE underflow control on x86/x86_64

[FX]

Updated patch, after Uros’ comments (except testing for != 0 in the testcase; I’d rather keep the existing > 0 test).

Bootstrapped and regtested on x86_64-apple-darwin13, tested by Uros on alpha.
Given that the patch is mostly x86 and alpha-specific, and Uros has approved it from that point of view, I’ve committed the patch as revision 212407.

FX


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