gcc -save-temps emits incorrect debug info in 3.4 (breaks distcc bootstraps)

[Alexandre Oliva]

Per,

Is there any reason why this bit, that made it to mainline, was
missing in the 3.4 branch?  Without it, the initial .file directive
refers to the .i file instead of the original .c file.

I'm bootstrapping and regression-testing this patch in 3.4.  Mark, if
it passes without regressions, is this ok for the branch?

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-- 
Alexandre Oliva             http://www.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}