[CUDA]Delayed diagnostics for the asm instructions.

Summary:
Adapted targetDiag for the CUDA and used for the delayed diagnostics in
asm constructs. Works for both host and device compilation sides.

Reviewers: tra, jlebar

Subscribers: jdoerfert, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D58463

llvm-svn: 354593