Add flag to configure noalias on Box<T>

To aid making an informed decision about the aliasing
rules of box, give users an option to remove `noalias`
from box.

compiler/rustc_session/src/options.rs

@@ -1209,6 +1209,8 @@ options! {
     binary_dep_depinfo: bool = (false, parse_bool, [TRACKED],
         "include artifacts (sysroot, crate dependencies) used during compilation in dep-info \
         (default: no)"),
+    box_noalias: Option<bool> = (None, parse_opt_bool, [TRACKED],
+        "emit noalias metadata for box (default: yes)"),
     branch_protection: Option<BranchProtection> = (None, parse_branch_protection, [TRACKED],
         "set options for branch target identification and pointer authentication on AArch64"),
     cf_protection: CFProtection = (CFProtection::None, parse_cfprotection, [TRACKED],