Revert "Revert "Upgrade to 5.0.71.48"" DO NOT MERGE

This reverts commit f2e3994fa5148cc3d9946666f0b0596290192b0e,
and updates the x64 makefile properly so it doesn't break that
build.

FPIIM-449

Change-Id: Ib83e35bfbae6af627451c926a9650ec57c045605
(cherry picked from commit 109988c7ccb6f3fd1a58574fa3dfb88beaef6632)
diff --git a/src/ast/ast-expression-rewriter.cc b/src/ast/ast-expression-rewriter.cc
index 49cc7f6..edee91d 100644
--- a/src/ast/ast-expression-rewriter.cc
+++ b/src/ast/ast-expression-rewriter.cc
@@ -398,10 +398,10 @@
 }
 
 
-void AstExpressionRewriter::VisitRewritableAssignmentExpression(
-    RewritableAssignmentExpression* node) {
+void AstExpressionRewriter::VisitRewritableExpression(
+    RewritableExpression* node) {
   REWRITE_THIS(node);
-  AST_REWRITE_PROPERTY(Expression, node, expression);
+  AST_REWRITE(Expression, node->expression(), node->Rewrite(replacement));
 }