[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/X86/inline-0bh.ll b/llvm/test/CodeGen/X86/inline-0bh.ll
index ceef395..b1e7e57 100644
--- a/llvm/test/CodeGen/X86/inline-0bh.ll
+++ b/llvm/test/CodeGen/X86/inline-0bh.ll
@@ -4,7 +4,7 @@
 ; Function Attrs: noinline nounwind
 define i32 @PR31007() {
 ; CHECK-LABEL: PR31007:
-; CHECK:       # BB#0: # %entry
+; CHECK:       # %bb.0: # %entry
 ; CHECK-NEXT:  #APP
 ; CHECK   :    addb $11, %al
 ; CHECK:       #NO_APP