Rework the Sema/AST/IRgen dance for the lambda closure type's

conversion to function pointer. Rather than having IRgen synthesize
the body of this function, we instead introduce a static member
function "__invoke" with the same signature as the lambda's
operator() in the AST. Sema then generates a body for the conversion
to function pointer which simply returns the address of __invoke. This
approach makes it easier to evaluate a call to the conversion function
as a constant, makes the linkage of the __invoke function follow the
normal rules for member functions, and may make life easier down the
road if we ever want to constexpr'ify some of lambdas.

Note that IR generation is responsible for filling in the body of
__invoke (Sema just adds a dummy body), because the body can't
generally be expressed in C++.

Eli, please review!

llvm-svn: 150783

clang/test/CodeGenCXX/lambda-expressions.cpp

@@ -47,8 +47,26 @@ int e(E a, E b, bool cond) { [a,b,cond](){ return (cond ? a : b).x; }(); }
 // CHECK: invoke i32 @"_ZZ1e1ES_bENK3$_4clEv"
 // CHECK: call void @"_ZZ1e1ES_bEN3$_4D1Ev"
 // CHECK: call void @"_ZZ1e1ES_bEN3$_4D1Ev"
+
 // CHECK: define internal i32 @"_ZZ1e1ES_bENK3$_4clEv"
 // CHECK: trunc i8
 // CHECK: load i32*
 // CHECK: ret i32
+
+void f() {
+  // CHECK: define void @_Z1fv()
+  // CHECK: {{call.*_5cvPFiiiEEv}}
+  // CHECK-NEXT: store i32 (i32, i32)*
+  // CHECK-NEXT: ret void
+  int (*fp)(int, int) = [](int x, int y){ return x + y; };
+}
+
+// CHECK: define internal i32 @"_ZZ1fvEN3$_58__invokeEii"
+// CHECK: store i32
+// CHECK-NEXT: store i32
+// CHECK-NEXT: load i32*
+// CHECK-NEXT: load i32*
+// CHECK-NEXT: call i32 @"_ZZ1fvENK3$_5clEii"
+// CHECK-NEXT: ret i32
+
 // CHECK: define internal void @"_ZZ1e1ES_bEN3$_4D2Ev"