[CodeGen] Unify MBB reference format in both MIR and debug output

As part of the unification of the debug format and the MIR format, print
MBB references as '%bb.5'.

The MIR printer prints the IR name of a MBB only for block definitions.

* find . \( -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#" << ([a-zA-Z0-9_]+)->getNumber\(\)/" << printMBBReference(*\1)/g'
* find . \( -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#" << ([a-zA-Z0-9_]+)\.getNumber\(\)/" << printMBBReference(\1)/g'
* find . \( -name "*.txt" -o -name "*.s" -o -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#([0-9]+)/%bb.\1/g'
* grep -nr 'BB#' and fix

Differential Revision: https://reviews.llvm.org/D40422

llvm-svn: 319665
diff --git a/llvm/test/CodeGen/Hexagon/hwloop-redef-imm.mir b/llvm/test/CodeGen/Hexagon/hwloop-redef-imm.mir
index 014908e..7b6044c 100644
--- a/llvm/test/CodeGen/Hexagon/hwloop-redef-imm.mir
+++ b/llvm/test/CodeGen/Hexagon/hwloop-redef-imm.mir
@@ -8,10 +8,10 @@
 # loop setup in the preheader).
 
 # CHECK:  [[R0:%[0-9]+]]:intregs = A2_tfrsi 1920
-# CHECK:  J2_loop0r %bb.1.b1, [[R0]]
+# CHECK:  J2_loop0r %bb.1, [[R0]]
 #
 # CHECK: bb.1.b1 (address-taken):
-# CHECK:   ENDLOOP0 %bb.1.b1
+# CHECK:   ENDLOOP0 %bb.1
 
 
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