std.Target: Remove Cpu.Arch.propeller2 and use a CPU feature instead.

src/codegen/llvm.zig

@@ -98,8 +98,7 @@ pub fn targetTriple(allocator: Allocator, target: std.Target) ![]const u8 {
         .ve => "ve",
 
         .kalimba,
-        .propeller1,
-        .propeller2,
+        .propeller,
         => unreachable, // Gated by hasLlvmSupport().
 
     };
@@ -11834,7 +11833,6 @@ fn toLlvmCallConvTag(cc_tag: std.builtin.CallingConvention.Tag, target: std.Targ
         .m68k_gnu,
         .msp430_eabi,
         .propeller1_sysv,
-        .propeller2_sysv,
         .s390x_sysv,
         .s390x_sysv_vx,
         .ve_sysv,
@@ -13023,8 +13021,7 @@ pub fn initializeLLVMTarget(arch: std.Target.Cpu.Arch) void {
 
         // LLVM does does not have a backend for these.
         .kalimba,
-        .propeller1,
-        .propeller2,
+        .propeller,
         => unreachable,
     }
 }