[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/AMDGPU/i1-copy-implicit-def.ll b/llvm/test/CodeGen/AMDGPU/i1-copy-implicit-def.ll
index f6bf0b0..37d05c7 100644
--- a/llvm/test/CodeGen/AMDGPU/i1-copy-implicit-def.ll
+++ b/llvm/test/CodeGen/AMDGPU/i1-copy-implicit-def.ll
@@ -3,7 +3,7 @@
 
 ; SILowerI1Copies was not handling IMPLICIT_DEF
 ; SI-LABEL: {{^}}br_implicit_def:
-; SI: BB#0:
+; SI: %bb.0:
 ; SI-NEXT: s_cbranch_scc1
 define amdgpu_kernel void @br_implicit_def(i32 addrspace(1)* %out, i32 %arg) #0 {
 bb: