re PR c++/10337 ("ambiguous overload"-error for non-ambiguous situation)

cp:
	PR c++/10337
	* call.c (joust): Don't warn about conversion ops that are exact
	or cv-conversions. Rearrange to avoid multiple type comparisons.
testsuite:
	PR c++/10337
	* g++.dg/warn/conv1.C: New test.
	* g++.old-deja/g++.other/conv7.C: Adjust.
	* g++.old-deja/g++.other/overload14.C: Adjust.

From-SVN: r66038