Update the amd64 target detection checks.
Patch contributed by Markus F.X.J. Oberhumer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19118 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/configure b/configure
index b335be5..85256d7 100755
--- a/configure
+++ b/configure
@@ -1742,11 +1742,11 @@
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
   case $target in
-  i?86-*)      llvm_cv_target_arch="x86" ;;
-  amd64-*)     llvm_cv_target_arch="amd64" ;;
-  sparc*-*)    llvm_cv_target_arch="Sparc" ;;
-  powerpc*-*)  llvm_cv_target_arch="PowerPC" ;;
-  *)           llvm_cv_target_arch="Unknown" ;;
+  i?86-*)                 llvm_cv_target_arch="x86" ;;
+  amd64-* | x86_64-*)     llvm_cv_target_arch="AMD64" ;;
+  sparc*-*)               llvm_cv_target_arch="Sparc" ;;
+  powerpc*-*)             llvm_cv_target_arch="PowerPC" ;;
+  *)                      llvm_cv_target_arch="Unknown" ;;
 esac
 fi
 echo "$as_me:$LINENO: result: $llvm_cv_target_arch" >&5
@@ -2955,7 +2955,7 @@
  ;;
     PowerPC) JIT=TARGET_HAS_JIT=1
  ;;
-    amd64)   JIT=
+    AMD64)   JIT=
  ;;
     *)       JIT=
  ;;