[clang] remove x86_64-unknown-uefi block

Author: RossComputerGuy

clang/lib/Driver/Driver.cpp

@@ -699,10 +699,6 @@ static llvm::Triple computeTargetTriple(const Driver &D,
     }
   }
 
-  // Currently the only architecture supported by *-uefi triples are x86_64.
-  if (Target.isUEFI() && Target.getArch() != llvm::Triple::x86_64)
-    D.Diag(diag::err_target_unknown_triple) << Target.str();
-
   // The `-maix[32|64]` flags are only valid for AIX targets.
   if (Arg *A = Args.getLastArgNoClaim(options::OPT_maix32, options::OPT_maix64);
       A && !Target.isOSAIX())

compiler-rt/lib/builtins/int_lib.h

@@ -49,7 +49,7 @@
 #define SYMBOL_NAME(name) XSTR(__USER_LABEL_PREFIX__) #name
 
 #if defined(__ELF__) || defined(__MINGW32__) || defined(__wasm__) ||           \
-    defined(_AIX)    || defined(__CYGWIN__)
+    defined(_AIX)    || defined(__CYGWIN__)  || defined(__UEFI__)
 #define COMPILER_RT_ALIAS(name, aliasname) \
   COMPILER_RT_ABI __typeof(name) aliasname __attribute__((__alias__(#name)));
 #elif defined(__APPLE__)