compiler: let LLVM set the x32 feature from the target triple on x86 targets

src/Compilation.zig

@@ -6808,6 +6808,7 @@ pub fn addCCArgs(
                     // We communicate these to Clang through the dedicated options.
                     if (std.mem.startsWith(u8, llvm_name, "soft-float") or
                         std.mem.startsWith(u8, llvm_name, "hard-float") or
+                        (target.cpu.arch.isX86() and std.mem.startsWith(u8, llvm_name, "x32")) or
                         (target.cpu.arch == .s390x and std.mem.eql(u8, llvm_name, "backchain")))
                         continue;
 

src/Package/Module.zig

@@ -347,6 +347,8 @@ pub fn create(arena: Allocator, options: CreateOptions) !*Package.Module {
                 // See https://github.com/ziglang/zig/issues/23539
                 if (target_util.isDynamicAMDGCNFeature(target, feature)) continue;
 
+                if (target.cpu.arch.isX86() and @as(std.Target.x86.Feature, @enumFromInt(feature.index)) == .x32) continue;
+
                 var is_enabled = target.cpu.features.isEnabled(feature.index);
                 if (target.cpu.arch == .s390x and @as(std.Target.s390x.Feature, @enumFromInt(feature.index)) == .backchain) {
                     is_enabled = !omit_frame_pointer;