Bug 1684163 - Suppress warning spam from gfx/angle/. r=jgilbert

Differential Revision: https://phabricator.services.mozilla.com/D100440

gfx/angle/moz.build.common

@@ -1,4 +1,10 @@
 AllowCompilerWarnings()
+if CONFIG['CC_TYPE'] in ('clang', 'clang-cl'):
+    CXXFLAGS += [
+        '-Wno-final-dtor-non-final-class',
+        '-Wno-implicit-const-int-float-conversion',
+        '-Wno-range-loop-construct',
+    ]
 
 if CONFIG['INTEL_ARCHITECTURE']:
     CXXFLAGS += CONFIG['SSE2_FLAGS']