Fix codegen tests on panic=abort targets

Author: nikic

Diff for: tests/codegen/unwind-landingpad-cold.rs

@@ -1,4 +1,5 @@
 // compile-flags: -Cno-prepopulate-passes
+// needs-unwind
 #![crate_type = "lib"]
 
 // This test checks that drop calls in unwind landing pads

Diff for: tests/codegen/unwind-landingpad-inline.rs

@@ -30,8 +30,7 @@ pub fn check_no_escape_in_landingpad(f: fn()) {
 // With inlining, the landing pad should be optimized out.
 // See https://github.com/rust-lang/rust/issues/87055
 // CHECK-LABEL: @check_eliminate_noop_drop
-// CHECK: start:
-// CHECK-NEXT: call void %g()
+// CHECK: call void %g()
 // CHECK-NEXT: ret void
 #[no_mangle]
 pub fn check_eliminate_noop_drop(g: fn()) {