Jan Ziak cb50277510 cmd/gc: check exponent overflow and underflow in mparith ...

A too large float constant is an error.
A too small float constant is rounded to zero.

Fixes #7419
Update #6902

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/76730046

2014-03-19 05:48:00 +01:00

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