[CodeGen] Print MachineBasicBlock labels using MIR syntax in -debug output

Instead of:

%bb.1: derived from LLVM BB %for.body

print:

bb.1.for.body:

Also use MIR syntax for MBB attributes like "align", "landing-pad", etc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@324563 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed