add -O to some tests which depend on attributes being added

Author: erikdesjardins

tests/codegen/loongarch-abi/loongarch64-lp64d-abi.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -C no-prepopulate-passes --target loongarch64-unknown-linux-gnu
+//@ compile-flags: -O -C no-prepopulate-passes --target loongarch64-unknown-linux-gnu
 //@ needs-llvm-components: loongarch
 
 #![feature(no_core, lang_items)]

tests/codegen/repr/transparent-imm-array.rs

@@ -1,5 +1,5 @@
 //@ revisions: arm-linux arm-android armv7-linux armv7-android mips thumb sparc
-//@ compile-flags: -C no-prepopulate-passes
+//@ compile-flags: -O -C no-prepopulate-passes
 
 //@[arm-linux] compile-flags: --target arm-unknown-linux-gnueabi
 //@[arm-linux] needs-llvm-components: arm

tests/codegen/repr/transparent-mips64.rs

@@ -1,8 +1,9 @@
 //@ revisions: mips64 mips64el
+//@ compile-flags: -O -C no-prepopulate-passes
 
-//@[mips64] compile-flags: -C no-prepopulate-passes --target mips64-unknown-linux-gnuabi64
+//@[mips64] compile-flags: --target mips64-unknown-linux-gnuabi64
 //@[mips64] needs-llvm-components: mips
-//@[mips64el] compile-flags: -C no-prepopulate-passes --target mips64el-unknown-linux-gnuabi64
+//@[mips64el] compile-flags: --target mips64el-unknown-linux-gnuabi64
 //@[mips64el] needs-llvm-components: mips
 
 // See ./transparent.rs

tests/codegen/repr/transparent-sysv64.rs

@@ -1,5 +1,5 @@
 //@ revisions: linux apple windows
-//@ compile-flags: -C no-prepopulate-passes
+//@ compile-flags: -O -C no-prepopulate-passes
 
 //@[linux] compile-flags: --target x86_64-unknown-linux-gnu
 //@[linux] needs-llvm-components: x86