Merge from gcc 4.7 branch to gccgo branch

[Ian Lance Taylor]

I have merged revision 192321 of the gcc 4.7 branch to the gccgo branch,
committed as revision 192330.  This brings GCC 4.7.2 and Go 1.0.3 to the
gccgo branch.

This is the last merge I plan to do from 4.7 to the gccgo branch.  After
this I plan to start merging from trunk to gccgo branch.  The gcc 4.7
branch will of course still be available and should be quite stable at
this point.

Ian