[PATCH] Must not produce Tag_CPU_arch_profile for pre-ARMv7 cores

[Artyom Skrobov]

Hello,

In the "Addenda to, and Errata in, the ABI for the ARM Architecture"
(http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ihi0045d/index.
html), section 2.3.5.2 "The target-related attributes" specifies that
Tag_CPU_arch_profile must have the default value of 0 when "Architecture
profile is not applicable (e.g. pre v7, or cross-profile code)". LLVM
violates the ABI by emitting this build attribute when targeting ARMv6M.

Our proposed patch fixes this, and additionally, it amends
test/MC/ARM/thumb2-mclass.s to match its apparent original purpose (to test
the ARMv6M/ARMv7M commonality), and creates a new test case for the
differences between ARMv6M and ARMv7M (i.e. the availability of basepri,
basepri_max and faultmask registers)

OK to commit?
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