Fix regression from r184810.

Specifically, CallExpr::getCalleeDecl() can return null, so make sure to
handle that correctly.

llvm-svn: 184813

clang/lib/Sema/SemaExceptionSpec.cpp

@@ -895,8 +895,10 @@ CanThrowResult Sema::canThrow(const Expr *E) {
       CT = CT_Dependent;
     else if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens()))
       CT = CT_Cannot;
-    else
+    else if (CE->getCalleeDecl())
       CT = canCalleeThrow(*this, E, CE->getCalleeDecl());
+    else
+      CT = CT_Can;
     if (CT == CT_Can)
       return CT;
     return mergeCanThrow(CT, canSubExprsThrow(*this, E));

clang/test/CXX/expr/expr.unary/expr.unary.noexcept/sema.cpp

@@ -39,6 +39,9 @@ void (*pallspec)() throw(...);
 void (*pintspec)() throw(int);
 void (*pemptyspec)() throw();
 
+typedef void (*funcptr)();
+funcptr returnsptr() throw();
+
 void callptr() {
   N(pnospec());
   N((*pnospec)());
@@ -48,6 +51,7 @@ void callptr() {
   N((*pintspec)());
   P(pemptyspec());
   P((*pemptyspec)());
+  N(returnsptr()());
 }
 
 struct S1 {