Hi,

This patches fixes one of the problems noted in PR d/87824, where
exception chaining does not work as per expected semantics if
-forder-blocks-and-partition is enabled on i386.

Having it default off if not explicitly given seems the most
reasonable thing to do, as there's no alternative way to determine if
two in-flight exceptions should be chained at run-time if this
optimization is turned on.

Bootstrapped and tested on x86_64-linux-gnu /
RUNTESTFLAGS="--target_board=unix/-m32"

Committed to trunk as r267985.

-- 
Iain
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gcc/d/ChangeLog:

2019-01-16  Iain Buclaw  <ibuclaw@gdcproject.org>

    PR d/87824
    * d-lang.cc (d_post_options): Disable implicit
    -forder-blocks-and-partition.
---