Fix codegen-units tests

I'm not sure what the signficance of `drop-glue i8` is, nor why one of
the tests had it appear while the others had it disappear. Either way it
doesn't seem like the presence or absense of it is the focus of the
tests.

Author: Aatch

src/test/codegen-units/item-collection/statics-and-consts.rs

@@ -60,3 +60,5 @@ fn main() {
 //~ TRANS_ITEM static statics_and_consts::foo[0]::STATIC2[2]
 
 //~ TRANS_ITEM fn statics_and_consts::main[0]
+
+//~ TRANS_ITEM drop-glue i8

src/test/codegen-units/partitioning/inlining-from-extern-crate.rs

@@ -57,5 +57,3 @@ mod mod2 {
         cgu_explicit_inlining::never_inlined();
     }
 }
-
-//~ TRANS_ITEM drop-glue i8

src/test/codegen-units/partitioning/local-inlining.rs

@@ -50,5 +50,3 @@ mod non_user {
 
     }
 }
-
-//~ TRANS_ITEM drop-glue i8

src/test/codegen-units/partitioning/local-transitive-inlining.rs

@@ -50,5 +50,3 @@ mod non_user {
 
     }
 }
-
-//~ TRANS_ITEM drop-glue i8