std.Target: Rename amdgpu module to amdgcn.

This was an inconsistency left over from c825b567b2.

CMakeLists.txt

@@ -376,7 +376,7 @@ set(ZIG_STAGE2_SOURCES
     lib/std/Target.zig
     lib/std/Target/Query.zig
     lib/std/Target/aarch64.zig
-    lib/std/Target/amdgpu.zig
+    lib/std/Target/amdgcn.zig
     lib/std/Target/arm.zig
     lib/std/Target/avr.zig
     lib/std/Target/bpf.zig

lib/compiler_rt/atomics.zig

@@ -42,7 +42,7 @@ const largest_atomic_size = switch (arch) {
 // Objects smaller than this threshold are implemented in terms of compare-exchange
 // of a larger value.
 const smallest_atomic_fetch_exch_size = switch (arch) {
-    // On AMDGPU, there are no instructions for atomic operations other than load and store
+    // On AMDGCN, there are no instructions for atomic operations other than load and store
     // (as of LLVM 15), and so these need to be implemented in terms of atomic CAS.
     .amdgcn => @sizeOf(u32),
     else => @sizeOf(u8),

lib/std/Target.zig

@@ -719,7 +719,7 @@ pub const Os = struct {
 
 pub const aarch64 = @import("Target/aarch64.zig");
 pub const arc = @import("Target/arc.zig");
-pub const amdgpu = @import("Target/amdgpu.zig");
+pub const amdgcn = @import("Target/amdgcn.zig");
 pub const arm = @import("Target/arm.zig");
 pub const avr = @import("Target/avr.zig");
 pub const bpf = @import("Target/bpf.zig");
@@ -1591,7 +1591,6 @@ pub const Cpu = struct {
                 .loongarch32, .loongarch64 => "loongarch",
                 .mips, .mipsel, .mips64, .mips64el => "mips",
                 .powerpc, .powerpcle, .powerpc64, .powerpc64le => "powerpc",
-                .amdgcn => "amdgpu",
                 .riscv32, .riscv64 => "riscv",
                 .sparc, .sparc64 => "sparc",
                 .s390x => "s390x",
@@ -1620,7 +1619,7 @@ pub const Cpu = struct {
                 .mips, .mipsel, .mips64, .mips64el => &mips.all_features,
                 .msp430 => &msp430.all_features,
                 .powerpc, .powerpcle, .powerpc64, .powerpc64le => &powerpc.all_features,
-                .amdgcn => &amdgpu.all_features,
+                .amdgcn => &amdgcn.all_features,
                 .riscv32, .riscv64 => &riscv.all_features,
                 .sparc, .sparc64 => &sparc.all_features,
                 .spirv, .spirv32, .spirv64 => &spirv.all_features,
@@ -1652,7 +1651,7 @@ pub const Cpu = struct {
                 .mips, .mipsel, .mips64, .mips64el => comptime allCpusFromDecls(mips.cpu),
                 .msp430 => comptime allCpusFromDecls(msp430.cpu),
                 .powerpc, .powerpcle, .powerpc64, .powerpc64le => comptime allCpusFromDecls(powerpc.cpu),
-                .amdgcn => comptime allCpusFromDecls(amdgpu.cpu),
+                .amdgcn => comptime allCpusFromDecls(amdgcn.cpu),
                 .riscv32, .riscv64 => comptime allCpusFromDecls(riscv.cpu),
                 .sparc, .sparc64 => comptime allCpusFromDecls(sparc.cpu),
                 .spirv, .spirv32, .spirv64 => comptime allCpusFromDecls(spirv.cpu),
@@ -1890,7 +1889,7 @@ pub const Cpu = struct {
                 };
             };
             return switch (arch) {
-                .amdgcn => &amdgpu.cpu.gfx600,
+                .amdgcn => &amdgcn.cpu.gfx600,
                 .arc => &arc.cpu.generic,
                 .arm, .armeb, .thumb, .thumbeb => &arm.cpu.generic,
                 .aarch64, .aarch64_be => &aarch64.cpu.generic,
@@ -1939,7 +1938,7 @@ pub const Cpu = struct {
         /// `Os.Tag.freestanding`.
         pub fn baseline(arch: Arch, os: Os) *const Model {
             return switch (arch) {
-                .amdgcn => &amdgpu.cpu.gfx906,
+                .amdgcn => &amdgcn.cpu.gfx906,
                 .arm, .armeb, .thumb, .thumbeb => &arm.cpu.baseline,
                 .aarch64 => switch (os.tag) {
                     .bridgeos, .driverkit, .macos => &aarch64.cpu.apple_m1,

tools/update_clang_options.zig

@@ -576,7 +576,7 @@ fn knownOption(name: []const u8) ?[]const u8 {
 
 const cpu_targets = struct {
     pub const aarch64 = std.Target.aarch64;
-    pub const amdgpu = std.Target.amdgpu;
+    pub const amdgcn = std.Target.amdgcn;
     pub const arc = std.Target.arc;
     pub const arm = std.Target.arm;
     pub const avr = std.Target.avr;

tools/update_cpu_features.zig

@@ -390,7 +390,7 @@ const llvm_targets = [_]LlvmTarget{
         },
     },
     .{
-        .zig_name = "amdgpu",
+        .zig_name = "amdgcn",
         .llvm_name = "AMDGPU",
         .td_name = "AMDGPU.td",
         .feature_overrides = &.{