Fix #12775 FP containerOutOfBounds with push_back() in loop

[chrchr-github]

No description provided.

[chrchr-github]

@danmar Any feedback?
cppcheck-premium had a couple FPs on template code and one true positive, so I disabled it for now. Not sure why the warnings were triggered, since I didn't change the affected code.

lib/astutils.h:69:16: style: Variable 't2' can be declared as pointer to const [constVariablePointer]
            T *t2 = tok->astOperand2();
               ^
lib/astutils.h:74:16: style: Variable 't1' can be declared as pointer to const [constVariablePointer]
            T *t1 = tok->astOperand1();
               ^
lib/findtoken.h:59:45: style: Parameter 'tok' can be declared as pointer to const [constParameterPointer]
    findTokensImpl(start, end, pred, [&](T* tok) {
                                            ^
lib/findtoken.h:184:16: style: Parameter 'tok' can be declared as pointer to const [constParameterPointer]
        [&](T* tok) {
               ^
lib/templatesimplifier.cpp:2188:25: style: Variable 'tok2' can be declared as pointer to const [constVariablePointer]
                Token * tok2 = findTemplateDeclarationEnd(tok3);

[chrchr-github]

Ping @danmar

[chrchr-github]

Ping @danmar