Bug 1456552 Make Optimized MinGW builds use -O# instead of falling through and collecting a -O r=ted

We use -O2 for js (because we can) and we use -O1 for the root because there is an x86 compiler bug
that is not immediately bypassable

MozReview-Commit-ID: CnDk2ko3jfo

--HG--
extra : rebase_source : bf889ab143bbf9480a261b06000d62cf0e1af8cc

js/src/old-configure.in

@@ -654,6 +654,8 @@ case "$target" in
         LIBS="$LIBS -lgdi32 -lwinmm -lwsock32"
         MOZ_FIX_LINK_PATHS=
 
+        MOZ_OPTIMIZE_FLAGS="-O2"
+
         WIN32_CONSOLE_EXE_LDFLAGS=-mconsole
         WIN32_GUI_EXE_LDFLAGS=-mwindows
     else

old-configure.in

@@ -862,6 +862,8 @@ case "$target" in
         LIBS="$LIBS -luuid -lgdi32 -lwinmm -lwsock32 -luserenv -lsecur32"
         MOZ_FIX_LINK_PATHS=
 
+        MOZ_OPTIMIZE_FLAGS="-O1"
+
         WIN32_CONSOLE_EXE_LDFLAGS=-mconsole
         WIN32_GUI_EXE_LDFLAGS=-mwindows