XCore : Fix bug in XCoreABIInfo::EmitVAArg()

Incorrect handling of 'double' and 'long long int'

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192436 91177308-0d34-0410-b5e6-96231b3b80d8
XCore target: add an xcore toolchain implementation

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192437 91177308-0d34-0410-b5e6-96231b3b80d8