Fix PR14881 by implementing conversion rules between int and complex int.

Prior to the patch, Clang does not properly promote types when a complex
integer operand is combined with an integer via a binary operator, or when
one is assigned to the other in either order.  This patch detects when
promotion is needed (and permissible) and generates the necessary code.

The test assmes no target has the same size operands for "char" and
"long long," and that no target performs arithmetic on char operands without
extending them to a larger format first.  If there are any targets for
which this is not the case, they should be XFAILed.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174181 91177308-0d34-0410-b5e6-96231b3b80d8
Fixed segmentation fault when a CFGBlock has NULL successor.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174182 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a string not seen without asserts

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174183 91177308-0d34-0410-b5e6-96231b3b80d8
Add check for @foo

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174185 91177308-0d34-0410-b5e6-96231b3b80d8