Bug 1598069 - make compliant with future clang 10 our clang based static analysis. r=froydnj

With clang 10 and up `getTemporary` has been replaced with the more versatile `getSubExpr`.
The commit that added this behaviour is: b0561b3346

Differential Revision: https://phabricator.services.mozilla.com/D54101

--HG--
extra : moz-landing-system : lando

build/clang-plugin/Utils.h

@@ -298,7 +298,13 @@ inline const Stmt *MaybeSkipOneTrivial(const Stmt *s) {
       return ewc->getSubExpr();
     }
     if (auto *mte = dyn_cast<MaterializeTemporaryExpr>(s)) {
+      // With clang 10 and up `getTemporary` has been replaced with the more
+      // versatile `getSubExpr`.
+#if CLANG_VERSION_FULL >= 1000
+      return mte->getSubExpr();
+#else
       return mte->GetTemporaryExpr();
+#endif
     }
     if (auto *bte = dyn_cast<CXXBindTemporaryExpr>(s)) {
       return bte->getSubExpr();