Update to submodule.

diff --git a/gcc.git b/gcc.git
index 2edfa86..73aa3b1 160000 (submodule)
--- a/gcc.git
+++ b/gcc.git
@@ -1 +1 @@
-Subproject commit 2edfa860e10b0ddccbc68de04a934bf04a867d50
+Subproject commit 73aa3b173fafa672d3dd189fd3db3cdb0917395d