Most vexing parse only reported on local variables

[llvmbot]

Bugzilla Link	9095
Version	trunk
OS	All
Reporter	LLVM Bugzilla Contributor
CC	@akyrtzi,@DougGregor,@linzj

Extended Description

In

struct foo {
};

struct bar {
  bar(foo x);
};

bar y(foo());

int main(void) {
  bar x(foo());
  return 0;
}

---

clang reports:

test.cc:11:8: warning: parentheses were disambiguated as a function declarator
  bar x(foo());
       ^~~~~~~

---

but no warning is printed for y.

[akyrtzi]

cloned to rdar://problem/8956519