[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/control-flow-fastregalloc.ll b/llvm/test/CodeGen/AMDGPU/control-flow-fastregalloc.ll
index 6f9c043..071bcbc 100644
--- a/llvm/test/CodeGen/AMDGPU/control-flow-fastregalloc.ll
+++ b/llvm/test/CodeGen/AMDGPU/control-flow-fastregalloc.ll
@@ -13,7 +13,7 @@
 ; VGPR: workitem_private_segment_byte_size = 12{{$}}
 
 
-; GCN: {{^}}; BB#0:
+; GCN: {{^}}; %bb.0:
 ; GCN: s_mov_b32 m0, -1
 ; GCN: ds_read_b32 [[LOAD0:v[0-9]+]]
 
@@ -91,7 +91,7 @@
 ; GCN-LABEL: {{^}}divergent_loop:
 ; VGPR: workitem_private_segment_byte_size = 12{{$}}
 
-; GCN: {{^}}; BB#0:
+; GCN: {{^}}; %bb.0:
 
 ; GCN: s_mov_b32 m0, -1
 ; GCN: ds_read_b32 [[LOAD0:v[0-9]+]]
@@ -167,7 +167,7 @@
 }
 
 ; GCN-LABEL: {{^}}divergent_if_else_endif:
-; GCN: {{^}}; BB#0:
+; GCN: {{^}}; %bb.0:
 
 ; GCN: s_mov_b32 m0, -1
 ; GCN: ds_read_b32 [[LOAD0:v[0-9]+]]