Fix #12806 FP constParameterReference related to designated initializer (#6486)

Author: chrchr-github

lib/tokenlist.cpp

@@ -830,7 +830,7 @@ static void compileTerm(Token *&tok, AST_state& state)
         } else if ((state.cpp && iscpp11init(tok)) || Token::simpleMatch(tok->previous(), "] {")) {
             Token *const end = tok->link();
             if (state.op.empty() || Token::Match(tok->previous(), "[{,]") || Token::Match(tok->tokAt(-2), "%name% (")) {
-                if (Token::Match(tok, "{ . %name% =|{")) {
+                if (Token::Match(tok->tokAt(-1), "!!, { . %name% =|{")) {
                     const int inArrayAssignment = state.inArrayAssignment;
                     state.inArrayAssignment = 1;
                     compileBinOp(tok, state, compileExpression);

test/testtokenize.cpp

@@ -6634,6 +6634,7 @@ class TestTokenizer : public TestFixture {
         ASSERT_EQUALS("double&(4[", testAst("void f(double(&)[4]) {}"));
         ASSERT_EQUALS("voidu*", testAst("int* g ( void* (f) (void*), void* u);")); // #12475
         ASSERT_EQUALS("f::(", testAst("::f();")); // #12544
+        ASSERT_EQUALS("(( (, f ({ (= (. c x) 0))))", testAst("f(c, { .x = 0 });", AstStyle::Z3)); // #12806
     }
 
     void asttemplate() { // uninstantiated templates will have <,>,etc..