Disable MIR optimization for alignment codegen tests

NRVO optimizes away the locals whose alignment is tested. I don't think this affects the purpose of the test.
rust-lang · May 17, 2020 · 8c71011 · 8c71011
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commit 8c71011
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diff --git a/src/test/codegen/align-enum.rs b/src/test/codegen/align-enum.rs
@@ -1,4 +1,4 @@
-// compile-flags: -C no-prepopulate-passes
+// compile-flags: -C no-prepopulate-passes -Z mir-opt-level=0
 // ignore-tidy-linelength
 
 #![crate_type = "lib"]

diff --git a/src/test/codegen/align-struct.rs b/src/test/codegen/align-struct.rs
@@ -1,4 +1,4 @@
-// compile-flags: -C no-prepopulate-passes
+// compile-flags: -C no-prepopulate-passes -Z mir-opt-level=0
 // ignore-tidy-linelength
 
 #![crate_type = "lib"]