Update Linux-specific tests

Author: petrochenkov

tests/ui/codegen/duplicated-path-in-error.rs

@@ -5,3 +5,5 @@
 // the path of the dylib.
 
 fn main() {}
+
+//~? ERROR couldn't load codegen backend /non-existing-one.so

tests/ui/sanitizer/cfi/canonical-jump-tables-requires-cfi.rs

@@ -6,3 +6,5 @@
 #![feature(no_core)]
 #![no_core]
 #![no_main]
+
+//~? ERROR `-Zsanitizer-cfi-canonical-jump-tables` requires `-Zsanitizer=cfi`

tests/ui/sanitizer/cfi/generalize-pointers-requires-cfi.rs

@@ -7,3 +7,5 @@
 #![feature(no_core)]
 #![no_core]
 #![no_main]
+
+//~? ERROR `-Zsanitizer-cfi-generalize-pointers` requires `-Zsanitizer=cfi` or `-Zsanitizer=kcfi`

tests/ui/sanitizer/cfi/normalize-integers-requires-cfi.rs

@@ -7,3 +7,5 @@
 #![feature(no_core)]
 #![no_core]
 #![no_main]
+
+//~? ERROR `-Zsanitizer-cfi-normalize-integers` requires `-Zsanitizer=cfi` or `-Zsanitizer=kcfi`

tests/ui/sanitizer/cfi/requires-lto.rs

@@ -6,3 +6,5 @@
 #![feature(no_core)]
 #![no_core]
 #![no_main]
+
+//~? ERROR `-Zsanitizer=cfi` requires `-Clto` or `-Clinker-plugin-lto`

tests/ui/sanitizer/cfi/with-rustc-lto-requires-single-codegen-unit.rs

@@ -6,3 +6,5 @@
 #![feature(no_core)]
 #![no_core]
 #![no_main]
+
+//~? ERROR `-Zsanitizer=cfi` with `-Clto` requires `-Ccodegen-units=1`

tests/ui/sanitizer/split-lto-unit-requires-lto.rs

@@ -6,3 +6,5 @@
 #![feature(no_core)]
 #![no_core]
 #![no_main]
+
+//~? ERROR `-Zsplit-lto-unit` requires `-Clto`, `-Clto=thin`, or `-Clinker-plugin-lto`