Enable more warnings on GCC and clang

BUG=angleproject:892

Change-Id: I74ca341f29b245f698d1e1ad43149a91db46817f
Reviewed-on: https://chromium-review.googlesource.com/271411
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>
diff --git a/src/libANGLE/formatutils.cpp b/src/libANGLE/formatutils.cpp
index 51e6a5a..0a78bac 100644
--- a/src/libANGLE/formatutils.cpp
+++ b/src/libANGLE/formatutils.cpp
@@ -228,13 +228,13 @@
       stencilBits(0),
       pixelBytes(0),
       componentCount(0),
+      compressed(false),
       compressedBlockWidth(0),
       compressedBlockHeight(0),
       format(GL_NONE),
       type(GL_NONE),
       componentType(GL_NONE),
       colorEncoding(GL_NONE),
-      compressed(false),
       textureSupport(NeverSupported),
       renderSupport(NeverSupported),
       filterSupport(NeverSupported)