[asan] Add instrumentation support for Myriad

1. Define Myriad-specific ASan constants.

2. Add code to generate an outer loop that checks that the address is
   in DRAM range, and strip the cache bit from the address.  The
   former is required because Myriad has no memory protection, and it
   is up to the instrumentation to range-check before using it to
   index into the shadow memory.

3. Do not add an unreachable instruction after the error reporting
   function; on Myriad such function may return if the run-time has
   not been initialized.

4. Add a test.

Differential Revision: https://reviews.llvm.org/D46451

llvm-svn: 332692

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