ARM: fix WoA PEI instruction selection
The ARM::BLX instruction is an ARM mode instruction. The Windows on ARM target
is limited to Thumb instructions. Correctly use the thumb mode tBLXr
instruction. This would manifest as an errant write into the object file as the
instruction is 4-bytes in length rather than 2. The result would be a corrupted
object file that would eventually result in an executable that would crash at
runtime.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208152
91177308-0d34-0410-b5e6-
96231b3b80d8
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