rustc_target: rename Arch::{Uknown,Other}

Prepare for additional enums like Vendor and Os which have true
`Unknown` variants. We want to use the same name for the escape hatch
for all of these, thus rename this one.

Author: tamird

compiler/rustc_target/src/asm/mod.rs

@@ -273,7 +273,7 @@ impl InlineAsmArch {
             Arch::Msp430 => Some(Self::Msp430),
             Arch::M68k => Some(Self::M68k),
             Arch::CSky => Some(Self::CSKY),
-            Arch::AmdGpu | Arch::Xtensa | Arch::Unknown(_) => None,
+            Arch::AmdGpu | Arch::Xtensa | Arch::Other(_) => None,
         }
     }
 }

compiler/rustc_target/src/callconv/mod.rs

@@ -702,7 +702,7 @@ impl<'a, Ty> FnAbi<'a, Ty> {
             Arch::RiscV32 | Arch::RiscV64 => riscv::compute_abi_info(cx, self),
             Arch::Wasm32 | Arch::Wasm64 => wasm::compute_abi_info(cx, self),
             Arch::Bpf => bpf::compute_abi_info(cx, self),
-            arch @ (Arch::PowerPC64LE | Arch::SpirV | Arch::Unknown(_)) => {
+            arch @ (Arch::PowerPC64LE | Arch::SpirV | Arch::Other(_)) => {
                 panic!("no lowering implemented for {arch}")
             }
         }

compiler/rustc_target/src/spec/mod.rs

@@ -1884,7 +1884,7 @@ crate::target_spec_enum! {
         X86_64 = "x86_64",
         Xtensa = "xtensa",
     }
-    other_variant = Unknown;
+    other_variant = Other;
 }
 
 impl Arch {
@@ -1921,7 +1921,7 @@ impl Arch {
             Self::X86 => sym::x86,
             Self::X86_64 => sym::x86_64,
             Self::Xtensa => sym::xtensa,
-            Self::Unknown(name) => rustc_span::Symbol::intern(name),
+            Self::Other(name) => rustc_span::Symbol::intern(name),
         }
     }
 }
@@ -3294,7 +3294,7 @@ impl Target {
             | Arch::SpirV
             | Arch::Wasm32
             | Arch::Wasm64
-            | Arch::Unknown(_) => return None,
+            | Arch::Other(_) => return None,
         })
     }
 

compiler/rustc_target/src/target_features.rs

@@ -977,7 +977,7 @@ impl Target {
             | Arch::PowerPC64LE
             | Arch::SpirV
             | Arch::Xtensa
-            | Arch::Unknown(_) => &[],
+            | Arch::Other(_) => &[],
         }
     }
 
@@ -1006,7 +1006,7 @@ impl Target {
             | Arch::PowerPC64LE
             | Arch::SpirV
             | Arch::Xtensa
-            | Arch::Unknown(_) => &[],
+            | Arch::Other(_) => &[],
         }
     }
 

src/tools/miri/src/shims/alloc.rs

@@ -54,7 +54,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             | Arch::Nvptx64
             | Arch::PowerPC64LE
             | Arch::SpirV
-            | Arch::Unknown(_)) => bug!("unsupported target architecture for malloc: `{arch}`"),
+            | Arch::Other(_)) => bug!("unsupported target architecture for malloc: `{arch}`"),
         };
         // The C standard only requires sufficient alignment for any *type* with size less than or
         // equal to the size requested. Types one can define in standard C seem to never have an alignment