OpenCL: handle shift operator with vector operands

Introduce a number of checks:
1. If LHS is a scalar, then RHS cannot be a vector.
2. Operands must be of integer type.
3. If both are vectors, then the number of elements must match.

Relax the requirement for "usual arithmetic conversions":
When LHS is a vector, a scalar RHS can simply be expanded into a
vector; OpenCL does not require that its rank be lower than the LHS.
For example, the following code is not an error even if the implicit
type of the constant literal is "int".

  char2 foo(char2 v) { return v << 1; }

Consolidate existing tests under CodeGenOpenCL, and add more tests
under SemaOpenCL.

llvm-svn: 228382

0 files changed, 0 insertions, 0 deletions