Renamed WIN64 to WIN_64

Fixes issue #2768

gcc/rust/ChangeLog:

	* backend/rust-compile-base.cc (HIRCompileBase::setup_abi_options):
	Renamed `WIN64` to `WIN_64`
	* util/rust-abi.cc (get_abi_from_string): Likewise
	(get_string_from_abi): Likewise
	* util/rust-abi.h (enum ABI): Likewise

Signed-off-by: Kushal Pal <kushalpal109@gmail.com>

Author: braw-lee

gcc/rust/backend/rust-compile-base.cc

@@ -463,7 +463,7 @@ HIRCompileBase::setup_abi_options (tree fndecl, ABI abi)
 
       break;
 
-    case Rust::ABI::WIN64:
+    case Rust::ABI::WIN_64:
       abi_tree = get_identifier ("ms_abi");
 
       break;

gcc/rust/util/rust-abi.cc

@@ -40,7 +40,7 @@ get_abi_from_string (const std::string &abi)
   else if (abi.compare ("sysv64") == 0)
     return Rust::ABI::SYSV64;
   else if (abi.compare ("win64") == 0)
-    return Rust::ABI::WIN64;
+    return Rust::ABI::WIN_64;
 
   return Rust::ABI::UNKNOWN;
 }
@@ -64,7 +64,7 @@ get_string_from_abi (Rust::ABI abi)
       return "fastcall";
     case Rust::ABI::SYSV64:
       return "sysv64";
-    case Rust::ABI::WIN64:
+    case Rust::ABI::WIN_64:
       return "win64";
 
     case Rust::ABI::UNKNOWN:

gcc/rust/util/rust-abi.h

@@ -30,7 +30,7 @@ enum ABI
   CDECL,
   STDCALL,
   FASTCALL,
-  WIN64,
+  WIN_64,
   SYSV64
 };