[clang] Fix assertion failure when initializing union with FAM

When initializing a union that constrain a struct with a flexible
array member, and the initializer list is empty, we currently
trigger an assertion failure. This happens because
getFlexibleArrayInitChars() assumes that the initializer list is
non-empty.

Fixes llvm#77085.

Author: nikic

clang/lib/AST/Decl.cpp

@@ -2835,7 +2835,7 @@ CharUnits VarDecl::getFlexibleArrayInitChars(const ASTContext &Ctx) const {
   if (!Ty || !Ty->getDecl()->hasFlexibleArrayMember())
     return CharUnits::Zero();
   auto *List = dyn_cast<InitListExpr>(getInit()->IgnoreParens());
-  if (!List)
+  if (!List || List->getNumInits() == 0)
     return CharUnits::Zero();
   const Expr *FlexibleInit = List->getInit(List->getNumInits() - 1);
   auto InitTy = Ctx.getAsConstantArrayType(FlexibleInit->getType());

clang/test/CodeGen/flexible-array-init.c

@@ -20,3 +20,11 @@ struct __attribute((packed, aligned(4))) { char a; int x; char z[]; } e = { 1, 2
 
 struct { int x; char y[]; } f = { 1, { 13, 15 } };
 // CHECK: @f ={{.*}} global <{ i32, [2 x i8] }> <{ i32 1, [2 x i8] c"\0D\0F" }>
+
+union {
+  struct {
+    int a;
+    char b[];
+  } x;
+} in_union = {};
+// CHECK: @in_union ={{.*}} global %union.anon zeroinitializer