[PATCH C++/testsuite] Remove pchtest check objects and compile with current tool

[Bernhard Reutner-Fischer]

Hi,

The pch-init leaves check objects lying around, remove them.

While at it, i noticed that i was getting warnings from the check since
it was invoced with xg++ -nostdinc++ on C source (in one of the two
iterations the check is run -- once per tool).
My suggestion is to use the correct tool to perform the pch check. Does
that make sense to you?

Regstrapped (together with the auto-removal patch just sent) on
x86_64-unknown-linux-gnu with trunk@204119 without regressions.

Ok for trunk?

gcc/testsuite/ChangeLog

2013-10-12  Bernhard Reutner-Fischer  <aldot@gcc.gnu.org>

	* lib/dg-pch.exp (pch-init): Remove pchtest check objects.
	Compile pchtest with current tool.
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