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[cc1] Fix pragma line emitted by -E

The correct format of a pragma line is

but cc1 was printing the file without quotes.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -790,7 +790,7 @@

 	putchar('\n');

 	if (strcmp(file, filenam)) {

 		strcpy(file, filenam);

-		s = "#line %u %s\n";

+		s = "#line %u \"%s\"\n";

 	} else if (nline+1 != lineno) {

 		s = "#line %u\n";

 	} else {