tcg/x86_64: Rename from i386

Emphasize that we're generating 64-bit code.
Drop the explicit rename from meson's cpu.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

MAINTAINERS

@@ -4057,10 +4057,10 @@ S: Maintained
 L: qemu-arm@nongnu.org
 F: tcg/aarch64/
 
-i386 TCG target
+X86 TCG target
 M: Richard Henderson <richard.henderson@linaro.org>
 S: Maintained
-F: tcg/i386/
+F: tcg/x86_64/
 
 LoongArch64 TCG target
 M: WANG Xuerui <git@xen0n.name>

meson.build

@@ -907,8 +907,6 @@ if have_tcg
   endif
   if get_option('tcg_interpreter')
     tcg_arch = 'tci'
-  elif host_arch == 'x86_64'
-    tcg_arch = 'i386'
   elif host_arch == 'ppc64'
     tcg_arch = 'ppc'
   endif