clang: forward -no-integrated-as from the driver

clang: forward -no-integrated-as from the driver

Forward the -no-integrated-as option to -cc1 rather than simply invoking the
appropriate tool.  This is useful since this option has been overloaded to
permit disabling of parsing inline assembly at the MC layer.

This re-applies the previous version of the patch with a renaming of the driver
option to the public name rather than the internal name (-target vs -triple).
The actual failure is fixed separately of an overly aggressive negative pattern
match in the MIPS driver tests.  It also fixes the incorrect test for targets
that have the integrated assembler disabled by default.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201960 91177308-0d34-0410-b5e6-96231b3b80d8