[PATCH] [MSan] [MIPS] Adding support for MIPS64

[Alexey Samsonov]

I'm fine with adjusting constants for MIPS you're doing here, but will let Kostya sign this off. I hope you will be able to setup the buildbot, otherwise we can frequently break you.

================
Comment at: lib/sanitizer_common/sanitizer_allocator.h:478
@@ +477,3 @@
+#if defined(__mips64)
+  // For mips64 virtual address space is just 40 bits, so its not possible
+  // to have kRegionSize >= 2^32
----------------
s/its/it's

http://reviews.llvm.org/D5906