Better fix for 13758a3d15

"SourceManager::isMacroArgExpansion has only one param in older Clang", which
caused false positives like warning about sal_False in

  CPPUNIT_ASSERT_EQUAL(guard.p->m1, sal_False);

in cppu/qa/cppumaker/test_cppumaker.cxx

Change-Id: I1c5a67527aef381e336d71cb8fefbb87961bbf96

compilerplugins/clang/compat.hxx

@@ -256,6 +256,24 @@ inline void addPPCallbacks(
 #endif
 }
 
+inline bool isMacroArgExpansion(
+    clang::CompilerInstance& compiler, clang::SourceLocation location,
+    clang::SourceLocation * startLocation)
+{
+#if CLANG_VERSION >= 30900
+    return compiler.getSourceManager().isMacroArgExpansion(
+        location, startLocation);
+#else
+    bool b = compiler.getSourceManager().isMacroArgExpansion(location);
+    if (b) {
+        startLocation* = compiler.getSourceManager()
+            .getSLocEntry(compiler.getSourceManager().getFileID(location))
+            .getExpansion().getExpansionLocStart();
+    }
+    return b;
+#endif
+}
+
 inline bool isMacroBodyExpansion(clang::CompilerInstance& compiler, clang::SourceLocation location)
 {
 #if CLANG_VERSION >= 30300