Rollup merge of #140457 - fneddy:fix_s390x_codegen_const_vector, r=Mark-Simulacrum

Use target-cpu=z13 on s390x codegen const vector test

The default s390x cpu(z10) does not have vector support. Setting target-cpu at least to z13 enables vectorisation for s390x architecture and makes the test pass.

Author: tgross35

tests/codegen/const-vector.rs

@@ -1,4 +1,8 @@
-//@ compile-flags: -C no-prepopulate-passes -Copt-level=0
+//@ revisions: OPT0 OPT0_S390X
+//@ [OPT0] ignore-s390x
+//@ [OPT0_S390X] only-s390x
+//@ [OPT0] compile-flags: -C no-prepopulate-passes -Copt-level=0
+//@ [OPT0_S390X] compile-flags: -C no-prepopulate-passes -Copt-level=0 -C target-cpu=z13
 
 // This test checks that constants of SIMD type are passed as immediate vectors.
 // We ensure that both vector representations (struct with fields and struct wrapping array) work.